Change base::LaunchProcess API slightly

Rather than passing the out param process handle via the options,
take it as a function argument.  This simplifies many callers.

BUG=88990

Review URL: http://codereview.chromium.org/7377012

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@92701 0039d316-1c4b-4281-b951-d872f2087c98

• base/process_util.h[diff]
• base/process_util_posix.cc[diff]
• base/process_util_unittest.cc[diff]
• base/process_util_win.cc[diff]
• base/test/multiprocess_test.cc[diff]
• chrome/browser/browser_main.cc[diff]
• chrome/browser/browser_main_win.cc[diff]
• chrome/browser/chromeos/input_method/input_method_manager.cc[diff]
• chrome/browser/chromeos/input_method/xkeyboard.cc[diff]
• chrome/browser/chromeos/system/touchpad_settings.cc[diff]
• chrome/browser/first_run/first_run_gtk.cc[diff]
• chrome/browser/first_run/first_run_win.cc[diff]
• chrome/browser/first_run/upgrade_util_linux.cc[diff]
• chrome/browser/first_run/upgrade_util_win.cc[diff]
• chrome/browser/importer/firefox_importer_unittest_utils_mac.cc[diff]
• chrome/browser/mac/relauncher.cc[diff]
• chrome/browser/platform_util_linux.cc[diff]
• chrome/browser/printing/printer_manager_dialog_linux.cc[diff]
• chrome/browser/process_info_snapshot_mac_unittest.cc[diff]
• chrome/browser/process_singleton_uitest.cc[diff]
• chrome/browser/safe_browsing/safe_browsing_test.cc[diff]
• chrome/browser/service/service_process_control.cc[diff]
• chrome/browser/shell_integration_linux.cc[diff]
• chrome/browser/ui/webui/options/advanced_options_utils_gtk.cc[diff]
• chrome/common/launchd_mac.mm[diff]
• chrome/installer/util/google_chrome_distribution.cc[diff]
• chrome/installer/util/product.cc[diff]
• chrome/service/cloud_print/cloud_print_proxy.cc[diff]
• chrome/service/service_child_process_host.cc[diff]
• chrome/test/automation/proxy_launcher.cc[diff]
• chrome/test/layout_test_http_server.cc[diff]
• chrome/test/live_sync/live_sync_test.cc[diff]
• chrome/test/out_of_proc_test_runner.cc[diff]
• chrome/test/ui_test_utils.cc[diff]
• chrome_frame/ready_mode/internal/registry_ready_mode_state.cc[diff]
• chrome_frame/test/chrome_frame_test_utils.cc[diff]
• content/browser/child_process_launcher.cc[diff]
• content/browser/zygote_host_linux.cc[diff]
• content/common/sandbox_policy.cc[diff]
• media/audio/linux/audio_manager_linux.cc[diff]
• media/audio/win/audio_manager_win.cc[diff]
• net/disk_cache/stress_cache.cc[diff]
• net/test/test_server_posix.cc[diff]
• net/tools/crash_cache/crash_cache.cc[diff]
• net/tools/dump_cache/dump_cache.cc[diff]