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

components/history/core/browser/history_backend.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.
 
 #include "components/history/core/browser/history_backend.h"
 
 #include <algorithm>
 #include <functional>
 #include <list>
 #include <map>
@@ skipping 1751 matching lines @@
       !thumbnail_db_->GetIconMappingsForPageURL(page_url, &icon_mappings))
     return;
 
   for (std::vector<IconMapping>::iterator m = icon_mappings.begin();
        m != icon_mappings.end(); ++m) {
     thumbnail_db_->SetFaviconOutOfDate(m->icon_id);
   }
   ScheduleCommit();
 }
 
-void HistoryBackend::CloneFavicons(const GURL& old_page_url,
-                                   const GURL& new_page_url) {
-  if (!thumbnail_db_)
-    return;
-
-  // Prevent cross-domain cloning.
-  if (old_page_url.GetOrigin() != new_page_url.GetOrigin())
-    return;
-
-  thumbnail_db_->CloneIconMappings(old_page_url, new_page_url);
-  ScheduleCommit();
-}
-
 void HistoryBackend::SetImportedFavicons(
     const favicon_base::FaviconUsageDataList& favicon_usage) {
   if (!db_ || !thumbnail_db_)
     return;
 
   Time now = Time::Now();
 
   // Track all URLs that had their favicons set or updated.
   std::set<GURL> favicons_changed;
 
@@ skipping 866 matching lines @@
   info.url_id = visit.url_id;
   info.time = visit.visit_time;
   info.transition = visit.transition;
   // If we don't have a delegate yet during setup or shutdown, we will drop
   // these notifications.
   if (delegate_)
     delegate_->NotifyAddVisit(info);
 }
 
 }  // namespace history