Remove history dependency from content.

chrome/chrome_browser.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.
 
 {
   'targets': [
     {
       'target_name': 'browser',
       'type': '<(library)',
       'msvs_guid': '5BF908A7-68FB-4A4B-99E3-8C749F1FE4EA',
@@ skipping 1122 matching lines @@
         'browser/history/history_backend.h',
         'browser/history/history_database.cc',
         'browser/history/history_database.h',
         'browser/history/history_marshaling.h',
         'browser/history/history_notifications.cc',
         'browser/history/history_notifications.h',
         'browser/history/history_publisher.cc',
         'browser/history/history_publisher.h',
         'browser/history/history_publisher_none.cc',
         'browser/history/history_publisher_win.cc',
+        'browser/history/history_tab_helper.cc',
+        'browser/history/history_tab_helper.h',
         'browser/history/history_types.cc',
         'browser/history/history_types.h',
         'browser/history/in_memory_database.cc',
         'browser/history/in_memory_database.h',
         'browser/history/in_memory_history_backend.cc',
         'browser/history/in_memory_history_backend.h',
         'browser/history/in_memory_url_index.cc',
         'browser/history/in_memory_url_index.h',
         'browser/history/page_usage_data.cc',
         'browser/history/page_usage_data.h',
@@ skipping 3419 matching lines @@
       'hard_dependency': 1,
     },
   ],
 }
 
 # Local Variables:
 # tab-width:2
 # indent-tabs-mode:nil
 # End:
 # vim: set expandtab tabstop=2 shiftwidth=2: