Reland old fix that was reverted without my knowledge.

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 1891 matching lines @@
         '../content/browser/speech/speech_recognition_request_unittest.cc',
         '../content/browser/speech/speech_recognizer_unittest.cc',
         '../content/browser/tab_contents/navigation_controller_unittest.cc',
         '../content/browser/tab_contents/navigation_entry_unittest.cc',
         '../content/browser/tab_contents/render_view_host_manager_unittest.cc',
         '../content/browser/webui/web_ui_unittest.cc',
         '../content/common/font_descriptor_mac_unittest.mm',
         '../content/common/gpu/gpu_feature_flags_unittest.cc',
         '../content/common/gpu/gpu_info_unittest.cc',
         '../content/common/gpu/gpu_video_decoder_unittest.cc',
+        '../content/common/hi_res_timer_manager_unittest.cc',
         '../content/common/notification_service_unittest.cc',
         '../content/common/process_watcher_unittest.cc',
         '../content/common/property_bag_unittest.cc',
         '../content/common/resource_dispatcher_unittest.cc',
         '../content/common/sandbox_mac_diraccess_unittest.mm',
         '../content/common/sandbox_mac_fontloading_unittest.mm',
         '../content/common/sandbox_mac_unittest_helper.h',
         '../content/common/sandbox_mac_unittest_helper.mm',
         '../content/common/sandbox_mac_system_access_unittest.mm',
         '../content/gpu/gpu_idirect3d9_mock_win.cc',
@@ skipping 1983 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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