Support GrabWindowSnapshot with no g_browser_process

chrome/chrome_tests.gypi

 # Copyright (c) 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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 1846 matching lines @@
         'browser/ui/webui/print_preview/print_preview_handler_unittest.cc',
         'browser/ui/webui/print_preview/print_preview_ui_unittest.cc',
         'browser/ui/webui/signin/login_ui_service_unittest.cc',
         'browser/ui/webui/sync_internals_ui_unittest.cc',
         'browser/ui/webui/sync_setup_handler_unittest.cc',
         'browser/ui/webui/theme_source_unittest.cc',
         'browser/ui/webui/web_dialog_web_contents_delegate_unittest.cc',
         'browser/ui/webui/web_ui_unittest.cc',
         'browser/ui/window_sizer/window_sizer_ash_unittest.cc',
         'browser/ui/window_sizer/window_sizer_unittest.cc',
-        'browser/ui/window_snapshot/window_snapshot_mac_unittest.mm',
         'browser/chrome_to_mobile_service_unittest.cc',
         'browser/user_style_sheet_watcher_unittest.cc',
         'browser/value_store/leveldb_value_store_unittest.cc',
         'browser/value_store/policy_value_store_unittest.cc',
         'browser/value_store/testing_value_store_unittest.cc',
         'browser/value_store/value_store_frontend_unittest.cc',
         'browser/value_store/value_store_unittest.cc',
         'browser/value_store/value_store_unittest.h',
         'browser/visitedlink/visitedlink_unittest.cc',
         'browser/web_applications/web_app_mac_unittest.mm',
@@ skipping 172 matching lines @@
         '../tools/json_schema_compiler/test/enums_unittest.cc',
         '../tools/json_schema_compiler/test/functions_as_parameters_unittest.cc',
         '../tools/json_schema_compiler/test/functions_on_types_unittest.cc',
         '../tools/json_schema_compiler/test/idl_schemas_unittest.cc',
         '../tools/json_schema_compiler/test/objects_unittest.cc',
         '../tools/json_schema_compiler/test/simple_api_unittest.cc',
         '../ui/views/test/test_views_delegate.cc',
         '../ui/views/test/test_views_delegate.h',
         '../ui/views/test/views_test_base.cc',
         '../ui/views/test/views_test_base.h',
+        '../ui/window_snapshot/window_snapshot_mac_unittest.mm',
         '../webkit/glue/web_intent_service_data_unittest.cc',
         '../webkit/quota/mock_storage_client.cc',
         '../webkit/quota/mock_storage_client.h',
       ],
       'conditions': [
         ['enable_background==0', {
           'sources/': [
             ['exclude', '^browser/background/'],
           ],
         }],
@@ skipping 2588 matching lines @@
                 '--result', '<@(_outputs)',
                 '--isolate', 'browser_tests.isolate',
               ],
             },
           ],
         },
       ],
     }],
   ],  # 'conditions'
 }