AcceleratorProvider: Make GetAcceleratorForCommandId const.

chrome/browser/ui/bookmarks/bookmark_context_menu_controller.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 CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_CONTEXT_MENU_CONTROLLER_H_
 #define CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_CONTEXT_MENU_CONTROLLER_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 50 matching lines @@
       const std::vector<const bookmarks::BookmarkNode*>& selection);
   ~BookmarkContextMenuController() override;
 
   ui::SimpleMenuModel* menu_model() { return menu_model_.get(); }
 
   // ui::SimpleMenuModel::Delegate implementation:
   bool IsCommandIdChecked(int command_id) const override;
   bool IsCommandIdEnabled(int command_id) const override;
   bool IsCommandIdVisible(int command_id) const override;
   bool GetAcceleratorForCommandId(int command_id,
-                                  ui::Accelerator* accelerator) override;
+                                  ui::Accelerator* accelerator) const override;
   void ExecuteCommand(int command_id, int event_flags) override;
   bool IsItemForCommandIdDynamic(int command_id) const override;
   base::string16 GetLabelForCommandId(int command_id) const override;
 
   void set_navigator(content::PageNavigator* navigator) {
     navigator_ = navigator;
   }
 
  private:
   void BuildMenu();
@@ skipping 18 matching lines @@
   std::vector<const bookmarks::BookmarkNode*> selection_;
   bookmarks::BookmarkModel* model_;
   std::unique_ptr<ui::SimpleMenuModel> menu_model_;
   // Used to detect deletion of |this| executing a command.
   base::WeakPtrFactory<BookmarkContextMenuController> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BookmarkContextMenuController);
 };
 
 #endif  // CHROME_BROWSER_UI_BOOKMARKS_BOOKMARK_CONTEXT_MENU_CONTROLLER_H_