SuggestionsService: implement SyncServiceObserver

chrome/chrome_browser.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.
 
 {
   'variables': {
     # All .cc, .h, .m, and .mm files under browser except for:
     # * tests and mocks.
     # * code below browser/chromeos
     # * code below browser/extensions
@@ skipping 518 matching lines @@
       'browser/search/most_visited_iframe_source.cc',
       'browser/search/most_visited_iframe_source.h',
       'browser/search/search.cc',
       'browser/search/search.h',
       'browser/search/suggestions/image_fetcher_impl.cc',
       'browser/search/suggestions/image_fetcher_impl.h',
       'browser/search/suggestions/suggestions_service_factory.cc',
       'browser/search/suggestions/suggestions_service_factory.h',
       'browser/search/suggestions/suggestions_source.cc',
       'browser/search/suggestions/suggestions_source.h',
-      'browser/search/suggestions/suggestions_utils.cc',
-      'browser/search/suggestions/suggestions_utils.h',
       'browser/search/thumbnail_source.cc',
       'browser/search/thumbnail_source.h',
       'browser/shell_integration.cc',
       'browser/shell_integration.h',
       'browser/shell_integration_android.cc',
       'browser/shell_integration_chromeos.cc',
       'browser/shell_integration_mac.mm',
       'browser/shell_integration_win.cc',
       'browser/site_details.cc',
       'browser/site_details.h',
@@ skipping 3691 matching lines @@
             '../components/components.gyp:rlz',
             '../components/components.gyp:search_engines',
             '../rlz/rlz.gyp:rlz_lib',
             'common',
           ],
         },
       ],
     }],
   ],
 }