Remove unused ThumbnailDatabase::UpdateIconMapping() and ThumbnailDatabase::CloneIconMappings()

components/favicon/core/favicon_service.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 COMPONENTS_FAVICON_CORE_FAVICON_SERVICE_H_
 #define COMPONENTS_FAVICON_CORE_FAVICON_SERVICE_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 153 matching lines @@
   // multiple favicon bitmaps for |favicon_id|, the largest favicon bitmap is
   // returned.
   base::CancelableTaskTracker::TaskId GetLargestRawFaviconForID(
       favicon_base::FaviconID favicon_id,
       const favicon_base::FaviconRawBitmapCallback& callback,
       base::CancelableTaskTracker* tracker);
 
   // Marks all types of favicon for the page as being out of date.
   void SetFaviconOutOfDateForPage(const GURL& page_url);
 
-  // Clones all icons from an existing page. This associates the icons from
-  // |old_page_url| with |new_page_url|, provided |new_page_url| has no
-  // recorded associations to any other icons.
-  // Needed if you want to declare favicons (tentatively) in advance, before a
-  // page is ever visited.
-  void CloneFavicon(const GURL& old_page_url, const GURL& new_page_url);
-
   // Allows the importer to set many favicons for many pages at once. The pages
   // must exist, any favicon sets for unknown pages will be discarded. Existing
   // favicons will not be overwritten.
   void SetImportedFavicons(
       const favicon_base::FaviconUsageDataList& favicon_usage);
 
   // Set the favicon for |page_url| for |icon_type| in the thumbnail database.
   // Unlike SetFavicons(), this method will not delete preexisting bitmap data
   // which is associated to |page_url| if at all possible. Use this method if
   // the favicon bitmaps for any of ui::GetSupportedScaleFactors() are not
@@ skipping 59 matching lines @@
   base::hash_set<MissingFaviconURLHash> missing_favicon_urls_;
   history::HistoryService* history_service_;
   FaviconClient* favicon_client_;
 
   DISALLOW_COPY_AND_ASSIGN(FaviconService);
 };
 
 }  // namespace favicon
 
 #endif  // COMPONENTS_FAVICON_CORE_FAVICON_SERVICE_H_