AcceleratorProvider: Make GetAcceleratorForCommandId const.

chrome/browser/ui/bookmarks/bookmark_context_menu_controller.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 "chrome/browser/ui/bookmarks/bookmark_context_menu_controller.h"
 
 #include <stddef.h>
 
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
@@ skipping 416 matching lines @@
     bookmarks::ManagedBookmarkService* managed =
         ManagedBookmarkServiceFactory::GetForProfile(profile_);
     return !managed->managed_node()->empty();
   }
 
   return true;
 }
 
 bool BookmarkContextMenuController::GetAcceleratorForCommandId(
     int command_id,
-    ui::Accelerator* accelerator) {
+    ui::Accelerator* accelerator) const {
   return false;
 }
 
 void BookmarkContextMenuController::BookmarkModelChanged() {
   if (delegate_)
     delegate_->CloseMenu();
 }