[Refactor] Simplify HistoryBackend::UpdateFaviconMappingsAndFetchImpl() signature

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 111 matching lines @@
   // Returns true if successful.
   bool DeleteFaviconBitmap(FaviconBitmapID bitmap_id);
 
   // Favicons ------------------------------------------------------------------
 
   // Sets the the favicon as out of date. This will set |last_updated| for all
   // of the bitmaps for |icon_id| to be out of date.
   bool SetFaviconOutOfDate(favicon_base::FaviconID icon_id);
 
   // Returns the id of the entry in the favicon database with the specified url
-  // and icon type. If |required_icon_type| contains multiple icon types and
-  // there are more than one matched icon in database, only one icon will be
-  // returned in the priority of TOUCH_PRECOMPOSED_ICON, TOUCH_ICON, and
-  // FAVICON, and the icon type is returned in icon_type parameter if it is not
-  // NULL.
+  // and icon type.
   // Returns 0 if no entry exists for the specified url.
   favicon_base::FaviconID GetFaviconIDForFaviconURL(
       const GURL& icon_url,
-      int required_icon_type,
-      favicon_base::IconType* icon_type);
+      favicon_base::IconType icon_type);
 
   // Gets the icon_url, icon_type and sizes for the specified |icon_id|.
   bool GetFaviconHeader(favicon_base::FaviconID icon_id,
                         GURL* icon_url,
                         favicon_base::IconType* icon_type);
 
   // Adds favicon with |icon_url|, |icon_type| and |favicon_sizes| to the
   // favicon db, returning its id.
   favicon_base::FaviconID AddFavicon(const GURL& icon_url,
                                      favicon_base::IconType icon_type);
@@ skipping 120 matching lines @@
 
   sql::Connection db_;
   sql::MetaTable meta_table_;
 
   HistoryBackendClient* backend_client_;
 };
 
 }  // namespace history
 
 #endif  // COMPONENTS_HISTORY_CORE_BROWSER_THUMBNAIL_DATABASE_H_