Adjust preference sync code to only sync user modifiable preferences.

chrome/chrome_tests.gypi

 # Copyright (c) 2010 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_dll_resource.h',
       'common/pref_names.cc',
       'common/pref_names.h',
@@ skipping 98 matching lines @@
         'test/automation/window_proxy.cc',
         'test/automation/window_proxy.h',
         'test/chrome_process_util.cc',
         'test/chrome_process_util.h',
         'test/chrome_process_util_mac.cc',
         'test/model_test_utils.cc',
         'test/model_test_utils.h',
         'test/profile_mock.h',
         'test/test_browser_window.h',
         'test/test_location_bar.h',
+        'test/testing_pref_service.cc',
+        'test/testing_pref_service.h',
         'test/testing_profile.cc',
         'test/testing_profile.h',
         'test/thread_observer_helper.h',
         'test/ui_test_utils.cc',
         'test/ui_test_utils.h',
         'test/ui_test_utils_linux.cc',
         'test/ui_test_utils_mac.cc',
         'test/ui_test_utils_win.cc',
       ],
       'conditions': [
@@ skipping 2599 matching lines @@
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }
 
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