First fix to minimize copying of image data.

chrome/browser/history/top_sites.h

 // Copyright (c) 2009 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_HISTORY_TOP_SITES_H_
 #define CHROME_BROWSER_HISTORY_TOP_SITES_H_
 
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/lock.h"
 #include "base/ref_counted.h"
+#include "base/ref_counted_memory.h"
 #include "chrome/browser/history/history_types.h"
-#include "chrome/common/ref_counted_util.h"
 #include "chrome/common/thumbnail_score.h"
 #include "googleurl/src/gurl.h"
 
 class SkBitmap;
 struct ThumbnailScore;
 
 namespace history {
 
 class TopSitesBackend;
 class TopSitesTest;
@@ skipping 93 matching lines @@
   // TODO(brettw) use the blacklist.
   //std::set<GURL> blacklist_;
 
   DISALLOW_COPY_AND_ASSIGN(TopSites);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_TOP_SITES_H_