Provide assumed favicon for intents if service provider page was never visited.

chrome/browser/history/history_backend.h

 // Copyright (c) 2011 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_HISTORY_BACKEND_H_
 #define CHROME_BROWSER_HISTORY_HISTORY_BACKEND_H_
 #pragma once
 
 #include <string>
 #include <utility>
@@ skipping 221 matching lines @@
                   scoped_refptr<RefCountedMemory> data,
                   IconType icon_type);
 
   void UpdateFaviconMappingAndFetch(scoped_refptr<GetFaviconRequest> request,
                                     const GURL& page_url,
                                     const GURL& icon_url,
                                     IconType icon_type);
 
   void SetFaviconOutOfDateForPage(const GURL& page_url);
 
+  void CloneFavicon(const GURL& old_page_url, const GURL& new_page_url);
+
   void SetImportedFavicons(
       const std::vector<ImportedFaviconUsage>& favicon_usage);
 
   // Downloads -----------------------------------------------------------------
 
   void GetNextDownloadId(scoped_refptr<DownloadNextIdRequest> request);
   void QueryDownloads(scoped_refptr<DownloadQueryRequest> request);
   void CleanUpInProgressEntries();
   void UpdateDownload(const DownloadPersistentStoreInfo& data);
   void UpdateDownloadPath(const FilePath& path, int64 db_handle);
@@ skipping 384 matching lines @@
   // Publishes the history to all indexers which are registered to receive
   // history data from us. Can be NULL if there are no listeners.
   scoped_ptr<HistoryPublisher> history_publisher_;
 
   DISALLOW_COPY_AND_ASSIGN(HistoryBackend);
 };
 
 }  // namespace history
 
 #endif  // CHROME_BROWSER_HISTORY_HISTORY_BACKEND_H_