Topsites become keyedService based.

chrome/browser/history/history_service.cc

 // Copyright (c) 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.
 
 // The history system runs on a background thread so that potentially slow
 // database operations don't delay the browser. This backend processing is
 // represented by HistoryBackend. The HistoryService's job is to dispatch to
 // that thread.
 //
 // Main thread                       History thread
@@ skipping 18 matching lines @@
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/thread.h"
 #include "base/time/time.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/history/download_row.h"
 #include "chrome/browser/history/history_backend.h"
 #include "chrome/browser/history/history_notifications.h"
 #include "chrome/browser/history/in_memory_history_backend.h"
 #include "chrome/browser/history/in_memory_url_index.h"
-#include "chrome/browser/history/top_sites.h"

[sdefresne, 2014/12/19 15:11:40]

Looks like it is unused, remove.

[Jitu( very slow this week), 2014/12/26 14:04:27]

Done.

+#include "chrome/browser/history/top_sites_provider.h"
 #include "chrome/browser/history/visit_database.h"
 #include "chrome/browser/history/visit_filter.h"
 #include "chrome/browser/history/web_history_service.h"
 #include "chrome/browser/history/web_history_service_factory.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/importer/imported_favicon_usage.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
@@ skipping 1235 matching lines @@
     const HistoryService::OnFaviconChangedCallback& callback) {
   DCHECK(thread_checker_.CalledOnValidThread());
   return favicon_changed_callback_list_.Add(callback);
 }
 
 void HistoryService::NotifyFaviconChanged(
     const std::set<GURL>& changed_favicons) {
   DCHECK(thread_checker_.CalledOnValidThread());
   favicon_changed_callback_list_.Notify(changed_favicons);
 }