Fix missing thumbnails for new profile with TopSites.

chrome/browser/history/thumbnail_database.h

 // Copyright (c) 2010 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_THUMBNAIL_DATABASE_H_
 #define CHROME_BROWSER_HISTORY_THUMBNAIL_DATABASE_H_
 
 #include <vector>
 
 #include "app/sql/connection.h"
@@ skipping 164 matching lines @@
   void InitFavIconsIndex();
 
   sql::Connection db_;
   sql::MetaTable meta_table_;
 
   // This object is created and managed by the history backend. We maintain an
   // opaque pointer to the object for our use.
   // This can be NULL if there are no indexers registered to receive indexing
   // data from us.
   const HistoryPublisher* history_publisher_;
+
+  // True if migration to TopSites has been done and the thumbnails
+  // table should not be used.
+  bool use_top_sites_;
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_THUMBNAIL_DATABASE_H_