Move bookmark_model_observer.h to the bookmarks component

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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 262 matching lines @@
         'browser/background/background_contents_service_factory.h',
         'browser/background/background_mode_manager.cc',
         'browser/background/background_mode_manager.h',
         'browser/background/background_mode_manager_chromeos.cc',
         'browser/background/background_mode_manager_aura.cc',
         'browser/background/background_mode_manager_mac.mm',
         'browser/background/background_mode_manager_win.cc',
         'browser/bitmap_fetcher.cc',
         'browser/bitmap_fetcher.h',
         'browser/bitmap_fetcher_delegate.h',
-        'browser/bookmarks/base_bookmark_model_observer.cc',
-        'browser/bookmarks/base_bookmark_model_observer.h',
         'browser/bookmarks/bookmark_codec.cc',
         'browser/bookmarks/bookmark_codec.h',
         'browser/bookmarks/bookmark_expanded_state_tracker.cc',
         'browser/bookmarks/bookmark_expanded_state_tracker.h',
         'browser/bookmarks/bookmark_html_writer.cc',
         'browser/bookmarks/bookmark_html_writer.h',
         'browser/bookmarks/bookmark_index.cc',
         'browser/bookmarks/bookmark_index.h',
         'browser/bookmarks/bookmark_model.cc',
         'browser/bookmarks/bookmark_model.h',
         'browser/bookmarks/bookmark_model_factory.cc',
         'browser/bookmarks/bookmark_model_factory.h',
-        'browser/bookmarks/bookmark_model_observer.h',
         'browser/bookmarks/bookmark_node_data.cc',
         'browser/bookmarks/bookmark_node_data.h',
         'browser/bookmarks/bookmark_node_data_mac.cc',
         'browser/bookmarks/bookmark_node_data_views.cc',
         'browser/bookmarks/bookmark_pasteboard_helper_mac.h',
         'browser/bookmarks/bookmark_pasteboard_helper_mac.mm',
         'browser/bookmarks/bookmark_stats.cc',
         'browser/bookmarks/bookmark_stats.h',
         'browser/bookmarks/bookmark_storage.cc',
         'browser/bookmarks/bookmark_storage.h',
@@ skipping 3416 matching lines @@
             'package_name': 'org/chromium/chrome/browser',
             'template_deps': ['browser/android/tab_load_status.h'],
           },
           'includes': [ '../build/android/java_cpp_template.gypi' ],
         },
       ],
      },
     ],
   ],
 }