There was confusion in the mock socket classes due to
overlapping names.  The MockSocket is not actually a socket.
It is an interface for fetching data for reads and writes
on a socket.  The MockClientSocket and MockTCPClientSocket
are the actual sockets.

Rename MockSocket to SocketDataProvider.
Rename SSLMockSocket to SSLSocketDataProvider.

Update all tests to reflect name change.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/384024

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@31640 0039d316-1c4b-4281-b951-d872f2087c98

• net/flip/flip_network_transaction_unittest.cc[diff]
• net/ftp/ftp_network_transaction_unittest.cc[diff]
• net/http/http_network_layer_unittest.cc[diff]
• net/http/http_network_transaction_unittest.cc[diff]
• net/socket/socket_test_util.cc[diff]
• net/socket/socket_test_util.h[diff]
• net/socket/socks5_client_socket_unittest.cc[diff]
• net/socket/socks_client_socket_unittest.cc[diff]
• net/socket_stream/socket_stream_unittest.cc[diff]
• net/websockets/websocket_unittest.cc[diff]