[Signin] Factor out a helper class to load a continue URL once Sync is configured.

chrome/chrome_tests_unit.gypi

 # Copyright 2012 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.
 {
   'targets': [
     {
       # This target contains mocks and test utilities that don't belong in
       # production libraries but are used by more than one test executable.
       'target_name': 'test_support_common',
       'type': 'static_library',
@@ skipping 1675 matching lines @@
         'browser/ui/search_engines/keyword_editor_controller_unittest.cc',
         'browser/ui/search/instant_page_unittest.cc',
         'browser/ui/search/instant_search_prerenderer_unittest.cc',
         'browser/ui/search/search_delegate_unittest.cc',
         'browser/ui/search/search_ipc_router_policy_unittest.cc',
         'browser/ui/search/search_ipc_router_unittest.cc',
         'browser/ui/search/search_model_unittest.cc',
         'browser/ui/search/search_tab_helper_unittest.cc',
         'browser/ui/startup/session_crashed_infobar_delegate_unittest.cc',
         'browser/ui/sync/one_click_signin_helper_unittest.cc',
+        'browser/ui/sync/one_click_signin_sync_observer_unittest.cc',
         'browser/ui/sync/one_click_signin_sync_starter_unittest.cc',
         'browser/ui/sync/profile_signin_confirmation_helper_unittest.cc',
         'browser/ui/sync/sync_promo_ui_unittest.cc',
         'browser/ui/tab_contents/tab_contents_iterator_unittest.cc',
         'browser/ui/tabs/pinned_tab_codec_unittest.cc',
         'browser/ui/tabs/pinned_tab_service_unittest.cc',
         'browser/ui/tabs/pinned_tab_test_utils.cc',
         'browser/ui/tabs/tab_menu_model_unittest.cc',
         'browser/ui/tabs/tab_strip_model_unittest.cc',
         'browser/ui/tabs/test_tab_strip_model_delegate.cc',
@@ skipping 1184 matching lines @@
             'browser/ui/app_list/test/fake_profile_store.h',
             'browser/ui/app_list/test/fast_show_pickler_unittest.cc',
             'browser/ui/views/app_list/linux/app_list_linux_unittest.cc',
             'browser/ui/views/app_list/win/app_list_win_unittest.cc',
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }