Only invoke WebKit methods in browsing data helpers on the WEBKIT thread.

chrome/chrome_tests.gypi

 # Copyright (c) 2011 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',
@@ skipping 2006 matching lines @@
       'defines': [ 'ALLOW_IN_PROC_BROWSER_TEST' ],
       'sources': [
         'app/breakpad_mac_stubs.mm',
         'app/chrome_command_ids.h',
         'app/chrome_dll.rc',
         'app/chrome_dll_resource.h',
         'app/chrome_dll_version.rc.version',
         'browser/autocomplete/autocomplete_browsertest.cc',
         'browser/browser_browsertest.cc',
         'browser/browsing_data_database_helper_browsertest.cc',
+        'browser/browsing_data_indexed_db_helper_browsertest.cc',
         'browser/browsing_data_local_storage_helper_browsertest.cc',
         'browser/child_process_security_policy_browsertest.cc',
         'browser/chromeos/cros/cros_in_process_browser_test.cc',
         'browser/chromeos/cros/cros_in_process_browser_test.h',
         'browser/chromeos/cros/cros_mock.cc',
         'browser/chromeos/cros/cros_mock.h',
         'browser/chromeos/cros/mock_cros_library.h',
         'browser/chromeos/cros/mock_cryptohome_library.h',
         'browser/chromeos/cros/mock_keyboard_library.h',
         'browser/chromeos/cros/mock_input_method_library.h',
@@ skipping 1646 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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