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

components/history/core/browser/history_service.cc

 // 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.
 
 // The history system runs on a background thread so that potentially slow
 // database operations don't delay the browser. This backend processing is
 // represented by HistoryBackend. The HistoryService's job is to dispatch to
 // that thread.
 //
 // Main thread                       History thread
@@ skipping 604 matching lines @@
 }
 
 void HistoryService::SetFaviconsOutOfDateForPage(const GURL& page_url) {
   DCHECK(thread_) << "History service being called after cleanup";
   DCHECK(thread_checker_.CalledOnValidThread());
   ScheduleTask(PRIORITY_NORMAL,
                base::Bind(&HistoryBackend::SetFaviconsOutOfDateForPage,
                           history_backend_.get(), page_url));
 }
 
-void HistoryService::CloneFavicons(const GURL& old_page_url,
-                                   const GURL& new_page_url) {
-  DCHECK(thread_) << "History service being called after cleanup";
-  DCHECK(thread_checker_.CalledOnValidThread());
-  ScheduleTask(PRIORITY_NORMAL,
-               base::Bind(&HistoryBackend::CloneFavicons,
-                          history_backend_.get(), old_page_url, new_page_url));
-}
-
 void HistoryService::SetImportedFavicons(
     const favicon_base::FaviconUsageDataList& favicon_usage) {
   DCHECK(thread_) << "History service being called after cleanup";
   DCHECK(thread_checker_.CalledOnValidThread());
   ScheduleTask(PRIORITY_NORMAL,
                base::Bind(&HistoryBackend::SetImportedFavicons,
                           history_backend_.get(), favicon_usage));
 }
 
 base::CancelableTaskTracker::TaskId HistoryService::QueryURL(
@@ skipping 489 matching lines @@
   return favicon_changed_callback_list_.Add(callback);
 }
 
 void HistoryService::NotifyFaviconChanged(
     const std::set<GURL>& changed_favicons) {
   DCHECK(thread_checker_.CalledOnValidThread());
   favicon_changed_callback_list_.Notify(changed_favicons);
 }
 
 }  // namespace history