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

components/history/core/browser/thumbnail_database.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_HISTORY_CORE_BROWSER_THUMBNAIL_DATABASE_H_
 #define COMPONENTS_HISTORY_CORE_BROWSER_THUMBNAIL_DATABASE_H_
 
 #include <vector>
 
 #include "base/gtest_prod_util.h"
@@ skipping 172 matching lines @@
   // All matched icon mappings are returned in descent order of IconType if
   // mapping_data is not NULL.
   bool GetIconMappingsForPageURL(const GURL& page_url,
                                  std::vector<IconMapping>* mapping_data);
 
   // Adds a mapping between the given page_url and icon_id.
   // Returns the new mapping id if the adding succeeds, otherwise 0 is returned.
   IconMappingID AddIconMapping(const GURL& page_url,
                                favicon_base::FaviconID icon_id);
 
-  // Updates the page and icon mapping for the given mapping_id with the given
-  // icon_id.
-  // Returns true if the update succeeded.
-  bool UpdateIconMapping(IconMappingID mapping_id,
-                         favicon_base::FaviconID icon_id);
-
   // Deletes the icon mapping entries for the given page url.
   // Returns true if the deletion succeeded.
   bool DeleteIconMappings(const GURL& page_url);
 
   // Deletes the icon mapping with |mapping_id|.
   // Returns true if the deletion succeeded.
   bool DeleteIconMapping(IconMappingID mapping_id);
 
   // Checks whether a favicon is used by any URLs in the database.
   bool HasMappingFor(favicon_base::FaviconID id);
 
-  // Clones the existing mappings from |old_page_url| if |new_page_url| has no
-  // mappings. Otherwise, will leave mappings alone.
-  bool CloneIconMappings(const GURL& old_page_url, const GURL& new_page_url);
-
   // The class to enumerate icon mappings. Use InitIconMappingEnumerator to
   // initialize.
   class IconMappingEnumerator {
    public:
     IconMappingEnumerator();
     ~IconMappingEnumerator();
 
     // Get the next icon mapping, return false if no more are available.
     bool GetNextIconMapping(IconMapping* icon_mapping);
 
@@ skipping 55 matching lines @@
 
   sql::Connection db_;
   sql::MetaTable meta_table_;
 
   HistoryClient* history_client_;
 };
 
 }  // namespace history
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_THUMBNAIL_DATABASE_H_