Topsites become keyedService based.

chrome/browser/history/chrome_history_client.cc

 // Copyright 2014 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.
 
 #include "chrome/browser/history/chrome_history_client.h"
 
 #include "base/logging.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/history/history_notifications.h"
 #include "chrome/browser/history/top_sites.h"
 #include "chrome/browser/ui/profile_error_dialog.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/grit/chromium_strings.h"
 #include "chrome/grit/generated_resources.h"
 #include "components/bookmarks/browser/bookmark_model.h"
 #include "content/public/browser/notification_service.h"
 
 using bookmarks::BookmarkModel;
 
-ChromeHistoryClient::ChromeHistoryClient(BookmarkModel* bookmark_model,
-                                         Profile* profile,
-                                         history::TopSites* top_sites)
+ChromeHistoryClient::ChromeHistoryClient(
+    BookmarkModel* bookmark_model,
+    Profile* profile,
+    const scoped_refptr<history::TopSites>& top_sites)
     : bookmark_model_(bookmark_model),
       profile_(profile),
       top_sites_(top_sites) {
   DCHECK(bookmark_model_);
   if (top_sites_)
     top_sites_->AddObserver(this);
 }
 
 ChromeHistoryClient::~ChromeHistoryClient() {
   if (top_sites_)
@@ skipping 45 matching lines @@
   // (meaning if we invoked HistoryService::Cleanup now, we would deadlock). To
   // break the deadlock we tell BookmarkModel it's about to be deleted so that
   // it can release the signal history is waiting on, allowing history to
   // shutdown (HistoryService::Cleanup to complete). In such a scenario history
   // sees an incorrect view of bookmarks, but it's better than a deadlock.
   bookmark_model_->Shutdown();
 }
 
 void ChromeHistoryClient::TopSitesLoaded(history::TopSites* top_sites) {
   content::NotificationService::current()->Notify(
-      chrome::NOTIFICATION_TOP_SITES_LOADED,
-      content::Source<Profile>(profile_),
+      chrome::NOTIFICATION_TOP_SITES_LOADED, content::Source<Profile>(profile_),
       content::Details<history::TopSites>(top_sites));
 }
 
 void ChromeHistoryClient::TopSitesChanged(history::TopSites* top_sites) {
   content::NotificationService::current()->Notify(
       chrome::NOTIFICATION_TOP_SITES_CHANGED,
       content::Source<history::TopSites>(top_sites),
       content::NotificationService::NoDetails());
 }