Topsites become keyedService based.

chrome/browser/thumbnails/thumbnail_service_impl.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_THUMBNAILS_THUMBNAIL_SERVICE_IMPL_H_
 #define CHROME_BROWSER_THUMBNAILS_THUMBNAIL_SERVICE_IMPL_H_
 
 #include "base/memory/ref_counted.h"
-#include "chrome/browser/history/top_sites.h"
+#include "chrome/browser/history/top_sites_provider.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/thumbnails/thumbnail_service.h"
 
 namespace base {
 class RefCountedMemory;
 }
 
 namespace thumbnails {
 
 // An implementation of ThumbnailService which delegates storage and most of
@@ skipping 11 matching lines @@
                         scoped_refptr<base::RefCountedMemory>* bytes) override;
   void AddForcedURL(const GURL& url) override;
   bool ShouldAcquirePageThumbnail(const GURL& url) override;
 
   // Implementation of RefcountedKeyedService.
   void ShutdownOnUIThread() override;
 
  private:
   ~ThumbnailServiceImpl() override;
 
-  scoped_refptr<history::TopSites> top_sites_;
+  scoped_refptr<history::TopSitesProvider> top_sites_provider;
   bool use_thumbnail_retargeting_;
 
   DISALLOW_COPY_AND_ASSIGN(ThumbnailServiceImpl);
 };
 
 }  // namespace thumbnails
 
 #endif  // CHROME_BROWSER_THUMBNAILS_THUMBNAIL_SERVICE_IMPL_H_