Make TopSites a RefcountedKeyedService

chrome/browser/android/provider/chrome_browser_provider.h

 // 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.
 
 #ifndef CHROME_BROWSER_ANDROID_PROVIDER_CHROME_BROWSER_PROVIDER_H_
 #define CHROME_BROWSER_ANDROID_PROVIDER_CHROME_BROWSER_PROVIDER_H_
 
 #include "base/android/jni_weak_ref.h"
 #include "base/android/scoped_java_ref.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 194 matching lines @@
 
   JavaObjectWeakGlobalRef weak_java_provider_;
 
   // Profile must outlive this object.
   //
   // BookmarkModel, HistoryService and history::TopSites lifetime is bound to
   // the lifetime of Profile, they are safe to use as long as the Profile is
   // alive.
   Profile* profile_;
   bookmarks::BookmarkModel* bookmark_model_;
-  history::TopSites* top_sites_;
+  scoped_refptr<history::TopSites> top_sites_;
   FaviconService* favicon_service_;
 
   scoped_ptr<AndroidHistoryProviderService> service_;
 
   base::CancelableTaskTracker cancelable_task_tracker_;
 
   // Used to register/unregister notification observer.
   content::NotificationRegistrar notification_registrar_;
   ScopedObserver<HistoryService, HistoryServiceObserver>
       history_service_observer_;
 
   bool handling_extensive_changes_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeBrowserProvider);
 };
 
 #endif  // CHROME_BROWSER_ANDROID_PROVIDER_CHROME_BROWSER_PROVIDER_H_