signin: force web signin flow initiated visits to accounts.google.com to their own process.

chrome/chrome_tests.gypi

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 1319 matching lines @@
         'browser/rlz/rlz_extension_apitest.cc',
         'browser/safe_browsing/local_safebrowsing_test_server.cc',
         'browser/safe_browsing/safe_browsing_blocking_page_test.cc',
         'browser/safe_browsing/safe_browsing_service_browsertest.cc',
         'browser/safe_browsing/safe_browsing_test.cc',
         'browser/service/service_process_control_browsertest.cc',
         'browser/sessions/better_session_restore_browsertest.cc',
         'browser/sessions/persistent_tab_restore_service_browsertest.cc',
         'browser/sessions/session_restore_browsertest.cc',
         'browser/sessions/tab_restore_browsertest.cc',
+        'browser/signin/signin_browsertest.cc',
         'browser/speech/extension_api/tts_extension_apitest.cc',
         'browser/speech/speech_input_extension_apitest.cc',
         'browser/speech/speech_recognition_bubble_browsertest.cc',
         'browser/spellchecker/spellcheck_service_browsertest.cc',
         'browser/ssl/ssl_browser_tests.cc',
         'browser/ssl/ssl_client_certificate_selector_test.cc',
         'browser/ssl/ssl_client_certificate_selector_test.h',
         'browser/sync_file_system/mock_local_change_processor.cc',
         'browser/sync_file_system/mock_local_change_processor.h',
         'browser/sync_file_system/mock_remote_file_sync_service.cc',
@@ skipping 1825 matching lines @@
               # more details.
               'DebugInformationFormat': '3',
               'ProgramDataBaseFileName': '<(PRODUCT_DIR)/browser_tests.exe.pdb',
             },
           },
         },
       ],
     }],
   ],  # 'conditions'
 }