Add xmllite and xmpp sources to third_party/

Add third_party/xmllite and third_party/xmpp source repos,
which used to be located in third_party/webrtc/libjingle since
the code is no longer used by WebRTC; only Chromium.

Modifications made:
* Include paths in jingle/ and remoting/ are updated to reflect
  the new location of xmllite and xmpp.
* Include paths in third_party/libjingle_xmpp/xmllite and
  third_party/libjingle_xmpp/xmpp are updated to reflect the new
  absolute paths to their own headers.
* Update previous include paths using non-absolute paths referencing
  "webrtc/libjingle/xmpp" to third_party/libjingle_xmpp/xmpp.
* Update includes from webrtc/ to third_party/webrtc
* Update includes of webrtc/base/logging.h to third_party/webrtc_overrides/webrtc/base/logging.h
* Added DEPS file in each folder, to restrict includes.

BUG=webrtc:5539

Review-Url: https://codereview.chromium.org/2443903004
Cr-Commit-Position: refs/heads/master@{#441371}

• jingle/BUILD.gn[diff]
• jingle/DEPS[diff]
• jingle/glue/chrome_async_socket.h[diff]
• jingle/notifier/DEPS[diff]
• jingle/notifier/base/fake_base_task.cc[diff]
• jingle/notifier/base/gaia_token_pre_xmpp_auth.cc[diff]
• jingle/notifier/base/gaia_token_pre_xmpp_auth.h[diff]
• jingle/notifier/base/notifier_options_util.cc[diff]
• jingle/notifier/base/notifier_options_util.h[diff]
• jingle/notifier/base/weak_xmpp_client.h[diff]
• jingle/notifier/base/xmpp_connection.cc[diff]
• jingle/notifier/base/xmpp_connection.h[diff]
• jingle/notifier/base/xmpp_connection_unittest.cc[diff]
• jingle/notifier/communicator/connection_settings.cc[diff]
• jingle/notifier/communicator/login.cc[diff]
• jingle/notifier/communicator/login.h[diff]
• jingle/notifier/communicator/login_settings.h[diff]
• jingle/notifier/communicator/login_settings_unittest.cc[diff]
• jingle/notifier/communicator/single_login_attempt.cc[diff]
• jingle/notifier/communicator/single_login_attempt.h[diff]
• jingle/notifier/communicator/single_login_attempt_unittest.cc[diff]
• jingle/notifier/listener/push_notifications_listen_task.cc[diff]
• jingle/notifier/listener/push_notifications_listen_task.h[diff]
• jingle/notifier/listener/push_notifications_send_update_task.cc[diff]
• jingle/notifier/listener/push_notifications_send_update_task.h[diff]
• jingle/notifier/listener/push_notifications_send_update_task_unittest.cc[diff]
• jingle/notifier/listener/push_notifications_subscribe_task.cc[diff]
• jingle/notifier/listener/push_notifications_subscribe_task.h[diff]
• jingle/notifier/listener/push_notifications_subscribe_task_unittest.cc[diff]
• jingle/notifier/listener/send_ping_task.cc[diff]
• jingle/notifier/listener/send_ping_task.h[diff]
• jingle/notifier/listener/send_ping_task_unittest.cc[diff]
• jingle/notifier/listener/xml_element_util.cc[diff]
• jingle/notifier/listener/xml_element_util_unittest.cc[diff]
• jingle/notifier/listener/xmpp_push_client.h[diff]
• remoting/DEPS[diff]
• remoting/client/client_status_logger_unittest.cc[diff]
• remoting/client/server_log_entry_client_unittest.cc[diff]
• remoting/host/BUILD.gn[diff]
• remoting/host/DEPS[diff]
• remoting/host/heartbeat_sender.cc[diff]
• remoting/host/heartbeat_sender_unittest.cc[diff]
• remoting/host/host_change_notification_listener.cc[diff]
• remoting/host/host_change_notification_listener_unittest.cc[diff]
• remoting/host/host_status_logger_unittest.cc[diff]
• remoting/host/pam_authorization_factory_posix.cc[diff]
• remoting/host/register_support_host_request.cc[diff]
• remoting/host/register_support_host_request_unittest.cc[diff]
• remoting/host/server_log_entry_host_unittest.cc[diff]
• remoting/protocol/BUILD.gn[diff]
• remoting/protocol/DEPS[diff]
• remoting/protocol/authenticator.cc[diff]
• remoting/protocol/authenticator_test_base.cc[diff]
• remoting/protocol/content_description.cc[diff]
• remoting/protocol/content_description_unittest.cc[diff]
• remoting/protocol/fake_authenticator.cc[diff]
• remoting/protocol/fake_session.cc[diff]
• remoting/protocol/ice_transport_unittest.cc[diff]
• remoting/protocol/jingle_info_request.cc[diff]
• remoting/protocol/jingle_messages.cc[diff]
• remoting/protocol/jingle_messages.h[diff]
• remoting/protocol/jingle_messages_unittest.cc[diff]
• remoting/protocol/jingle_session.cc[diff]
• remoting/protocol/jingle_session_manager.cc[diff]
• remoting/protocol/jingle_session_unittest.cc[diff]
• remoting/protocol/me2me_host_authenticator_factory.cc[diff]
• remoting/protocol/negotiating_authenticator_base.cc[diff]
• remoting/protocol/negotiating_authenticator_unittest.cc[diff]
• remoting/protocol/negotiating_client_authenticator.cc[diff]
• remoting/protocol/negotiating_host_authenticator.cc[diff]
• remoting/protocol/pairing_authenticator_base.h[diff]
• remoting/protocol/pairing_client_authenticator.cc[diff]
• remoting/protocol/pairing_host_authenticator.cc[diff]
• remoting/protocol/protocol_mock_objects.h[diff]
• remoting/protocol/rejecting_authenticator.cc[diff]
• remoting/protocol/spake2_authenticator.cc[diff]
• remoting/protocol/spake2_authenticator_unittest.cc[diff]
• remoting/protocol/ssl_hmac_channel_authenticator_unittest.cc[diff]
• remoting/protocol/third_party_authenticator_base.cc[diff]
• remoting/protocol/third_party_authenticator_base.h[diff]
• remoting/protocol/third_party_authenticator_unittest.cc[diff]
• remoting/protocol/third_party_client_authenticator.cc[diff]
• remoting/protocol/third_party_host_authenticator.cc[diff]
• remoting/protocol/v2_authenticator.cc[diff]
• remoting/protocol/v2_authenticator_unittest.cc[diff]
• remoting/protocol/validating_authenticator.cc[diff]
• remoting/protocol/validating_authenticator_unittest.cc[diff]
• remoting/protocol/webrtc_transport.cc[diff]
• remoting/protocol/webrtc_transport_unittest.cc[diff]
• remoting/signaling/BUILD.gn[diff]
• remoting/signaling/DEPS[diff]
• remoting/signaling/delegating_signal_strategy.cc[diff]
• remoting/signaling/fake_signal_strategy.cc[diff]
• remoting/signaling/iq_sender.cc[diff]
• remoting/signaling/iq_sender_unittest.cc[diff]
• remoting/signaling/log_to_server.cc[diff]
• remoting/signaling/mock_signal_strategy.h[diff]
• remoting/signaling/push_notification_subscriber.cc[diff]
• remoting/signaling/server_log_entry.cc[diff]
• remoting/signaling/server_log_entry_unittest.cc[diff]
• remoting/signaling/xmpp_login_handler.cc[diff]
• remoting/signaling/xmpp_login_handler_unittest.cc[diff]
• remoting/signaling/xmpp_signal_strategy.cc[diff]
• remoting/signaling/xmpp_signal_strategy_unittest.cc[diff]
• remoting/signaling/xmpp_stream_parser.cc[diff]
• remoting/signaling/xmpp_stream_parser_unittest.cc[diff]
• third_party/libjingle_xmpp/BUILD.gn[Added - diff]
• third_party/libjingle_xmpp/DEPS[Added - diff]
• third_party/libjingle_xmpp/LICENSE[Added - diff]
• third_party/libjingle_xmpp/OWNERS[Added - diff]
• third_party/libjingle_xmpp/README.chromium[Added - diff]
• third_party/libjingle_xmpp/run_all_unittests.cc[Added - diff]
• third_party/libjingle_xmpp/xmllite/DEPS[Added - diff]
• third_party/libjingle_xmpp/xmllite/qname.cc[Added - diff]
• third_party/libjingle_xmpp/xmllite/qname.h[Added - diff]
• third_party/libjingle_xmpp/xmllite/qname_unittest.cc[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlbuilder.cc[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlbuilder.h[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlbuilder_unittest.cc[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlconstants.cc[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlconstants.h[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlelement.cc[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlelement.h[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlelement_unittest.cc[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlnsstack.cc[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlnsstack.h[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlnsstack_unittest.cc[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlparser.cc[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlparser.h[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlparser_unittest.cc[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlprinter.cc[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlprinter.h[Added - diff]
• third_party/libjingle_xmpp/xmllite/xmlprinter_unittest.cc[Added - diff]
• third_party/libjingle_xmpp/xmpp/DEPS[Added - diff]
• third_party/libjingle_xmpp/xmpp/asyncsocket.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/constants.cc[Added - diff]
• third_party/libjingle_xmpp/xmpp/constants.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/fakexmppclient.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/jid.cc[Added - diff]
• third_party/libjingle_xmpp/xmpp/jid.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/jid_unittest.cc[Added - diff]
• third_party/libjingle_xmpp/xmpp/jingleinfotask.cc[Added - diff]
• third_party/libjingle_xmpp/xmpp/jingleinfotask.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/plainsaslhandler.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/prexmppauth.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/saslcookiemechanism.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/saslhandler.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/saslmechanism.cc[Added - diff]
• third_party/libjingle_xmpp/xmpp/saslmechanism.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/saslplainmechanism.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/util_unittest.cc[Added - diff]
• third_party/libjingle_xmpp/xmpp/util_unittest.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/xmppclient.cc[Added - diff]
• third_party/libjingle_xmpp/xmpp/xmppclient.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/xmppclientsettings.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/xmppengine.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/xmppengine_unittest.cc[Added - diff]
• third_party/libjingle_xmpp/xmpp/xmppengineimpl.cc[Added - diff]
• third_party/libjingle_xmpp/xmpp/xmppengineimpl.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/xmppengineimpl_iq.cc[Added - diff]
• third_party/libjingle_xmpp/xmpp/xmpplogintask.cc[Added - diff]
• third_party/libjingle_xmpp/xmpp/xmpplogintask.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/xmpplogintask_unittest.cc[Added - diff]
• third_party/libjingle_xmpp/xmpp/xmppstanzaparser.cc[Added - diff]
• third_party/libjingle_xmpp/xmpp/xmppstanzaparser.h[Added - diff]
• third_party/libjingle_xmpp/xmpp/xmppstanzaparser_unittest.cc[Added - diff]
• third_party/libjingle_xmpp/xmpp/xmpptask.cc[Added - diff]
• third_party/libjingle_xmpp/xmpp/xmpptask.h[Added - diff]