Move history extension API implementation to history dir.

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': 'static_library',
       'dependencies': [
@@ skipping 1006 matching lines @@
         'browser/extensions/extension_file_browser_private_api.cc',
         'browser/extensions/extension_file_browser_private_api.h',
         'browser/extensions/extension_function.cc',
         'browser/extensions/extension_function.h',
         'browser/extensions/extension_function_dispatcher.cc',
         'browser/extensions/extension_function_dispatcher.h',
         'browser/extensions/extension_global_error.cc',
         'browser/extensions/extension_global_error.h',
         'browser/extensions/extension_global_error_badge.cc',
         'browser/extensions/extension_global_error_badge.h',
-        'browser/extensions/extension_history_api.cc',
-        'browser/extensions/extension_history_api.h',
-        'browser/extensions/extension_history_api_constants.cc',
-        'browser/extensions/extension_history_api_constants.h',
         'browser/extensions/extension_host.cc',
         'browser/extensions/extension_host.h',
         'browser/extensions/extension_host_mac.h',
         'browser/extensions/extension_host_mac.mm',
         'browser/extensions/extension_i18n_api.cc',
         'browser/extensions/extension_i18n_api.h',
         'browser/extensions/extension_icon_manager.cc',
         'browser/extensions/extension_icon_manager.h',
         'browser/extensions/extension_idle_api.cc',
         'browser/extensions/extension_idle_api.h',
@@ skipping 279 matching lines @@
         'browser/history/download_database.cc',
         'browser/history/download_database.h',
         'browser/history/expire_history_backend.cc',
         'browser/history/expire_history_backend.h',
         'browser/history/history.cc',
         'browser/history/history.h',
         'browser/history/history_backend.cc',
         'browser/history/history_backend.h',
         'browser/history/history_database.cc',
         'browser/history/history_database.h',
+        'browser/history/history_extension_api.cc',
+        'browser/history/history_extension_api.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',
@@ skipping 3851 matching lines @@
       'type': 'static_library',
       'sources': [ 'browser/history/in_memory_url_index_cache.proto' ],
       'variables': {
         'proto_in_dir': 'browser/history',
         'proto_out_dir': 'chrome/browser/history',
       },
       'includes': [ '../build/protoc.gypi' ]
     },
   ],
 }