AcceleratorProvider: Make GetAcceleratorForCommandId const.

chrome/browser/ui/ash/launcher/launcher_context_menu.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_ASH_LAUNCHER_LAUNCHER_CONTEXT_MENU_H_
 #define CHROME_BROWSER_UI_ASH_LAUNCHER_LAUNCHER_CONTEXT_MENU_H_
 
 #include "ash/common/shelf/shelf_alignment_menu.h"
 #include "ash/common/shelf/shelf_item_types.h"
 #include "base/gtest_prod_util.h"
@@ skipping 18 matching lines @@
   static LauncherContextMenu* Create(ChromeLauncherControllerImpl* controller,
                                      const ash::ShelfItem* item,
                                      ash::WmShelf* wm_shelf);
 
   // ui::SimpleMenuModel::Delegate overrides:
   bool IsItemForCommandIdDynamic(int command_id) const override;
   base::string16 GetLabelForCommandId(int command_id) const override;
   bool IsCommandIdChecked(int command_id) const override;
   bool IsCommandIdEnabled(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;
 
  protected:
   enum MenuItem {
     MENU_OPEN_NEW,
     MENU_CLOSE,
     MENU_PIN,
     LAUNCH_TYPE_PINNED_TAB,
     LAUNCH_TYPE_REGULAR_TAB,
     LAUNCH_TYPE_FULLSCREEN,
@@ skipping 45 matching lines @@
   ash::ShelfItem item_;
 
   ash::ShelfAlignmentMenu shelf_alignment_menu_;
 
   ash::WmShelf* wm_shelf_;
 
   DISALLOW_COPY_AND_ASSIGN(LauncherContextMenu);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_LAUNCHER_LAUNCHER_CONTEXT_MENU_H_