Move CancelableTaskTracker to //base/task/CancelableTaskTracker.

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 1758 matching lines @@
         'browser/web_applications/web_app_mac_unittest.mm',
         'browser/web_applications/web_app_unittest.cc',
         'browser/web_resource/eula_accepted_notifier_unittest.cc',
         'browser/web_resource/promo_resource_service_mobile_ntp_unittest.cc',
         'browser/web_resource/promo_resource_service_unittest.cc',
         'browser/web_resource/resource_request_allowed_notifier_test_util.cc',
         'browser/web_resource/resource_request_allowed_notifier_test_util.h',
         'browser/web_resource/resource_request_allowed_notifier_unittest.cc',
         'browser/webdata/keyword_table_unittest.cc',
         'browser/webdata/web_apps_table_unittest.cc',
-        'common/cancelable_task_tracker_unittest.cc',
         'common/chrome_paths_unittest.cc',
         'common/chrome_content_client_unittest.cc',
         'common/cloud_print/cloud_print_helpers_unittest.cc',
         'common/content_settings_helper_unittest.cc',
         'common/content_settings_pattern_parser_unittest.cc',
         'common/content_settings_pattern_unittest.cc',
         'common/crash_keys_unittest.cc',
         'common/extensions/api/commands/commands_manifest_unittest.cc',
         'common/extensions/api/extension_action/browser_action_manifest_unittest.cc',
         'common/extensions/api/extension_action/page_action_manifest_unittest.cc',
@@ skipping 1116 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'
 }