Restore SnapshotTabHelper temporarily

chrome/chrome_browser_ui.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_ui',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 1288 matching lines @@
         'browser/ui/search_engines/search_engine_tab_helper.h',
         'browser/ui/search_engines/search_engine_tab_helper_delegate.cc',
         'browser/ui/search_engines/search_engine_tab_helper_delegate.h',
         'browser/ui/search_engines/template_url_fetcher_ui_callbacks.cc',
         'browser/ui/search_engines/template_url_fetcher_ui_callbacks.h',
         'browser/ui/search_engines/template_url_table_model.cc',
         'browser/ui/search_engines/template_url_table_model.h',
         'browser/ui/simple_message_box.h',
         'browser/ui/singleton_tabs.cc',
         'browser/ui/singleton_tabs.h',
+        'browser/ui/snapshot_tab_helper.cc',
+        'browser/ui/snapshot_tab_helper.h',
         'browser/ui/startup/autolaunch_prompt.cc',
         'browser/ui/startup/autolaunch_prompt_win.cc',
         'browser/ui/startup/autolaunch_prompt.h',
         'browser/ui/startup/bad_flags_prompt.cc',
         'browser/ui/startup/bad_flags_prompt.h',
         'browser/ui/startup/default_browser_prompt.cc',
         'browser/ui/startup/default_browser_prompt.h',
         'browser/ui/startup/default_browser_prompt_win.cc',
         'browser/ui/startup/obsolete_os_info_bar.cc',
         'browser/ui/startup/obsolete_os_info_bar.h',
@@ skipping 1549 matching lines @@
         }],
         ['enable_message_center==1', {
           'dependencies': [
             '../ui/message_center/message_center.gyp:message_center',
           ],
         }],
       ],
     },
   ],
 }