AcceleratorProvider: Make GetAcceleratorForCommandId const.

chrome/browser/renderer_context_menu/render_view_context_menu_test_util.h

 // Copyright 2014 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_RENDERER_CONTEXT_MENU_RENDER_VIEW_CONTEXT_MENU_TEST_UTIL_H_
 #define CHROME_BROWSER_RENDERER_CONTEXT_MENU_RENDER_VIEW_CONTEXT_MENU_TEST_UTIL_H_
 
 #include <stddef.h>
 
 #include "base/files/file_path.h"
@@ skipping 24 matching lines @@
   // This is a lightweight method to create a test RenderViewContextMenu
   // instance.
   // Use the constructor if you want to create menu with fine-grained params.
   static TestRenderViewContextMenu* Create(content::WebContents* web_contents,
                                            const GURL& page_url,
                                            const GURL& link_url,
                                            const GURL& frame_url);
 
   // Implementation of pure virtuals in RenderViewContextMenu.
   bool GetAcceleratorForCommandId(int command_id,
-                                  ui::Accelerator* accelerator) override;
+                                  ui::Accelerator* accelerator) const override;
 
   // Returns true if the command specified by |command_id| is present
   // in the menu.
   // A list of command ids can be found in chrome/app/chrome_command_ids.h.
   bool IsItemPresent(int command_id);
 
   // Returns true if a command specified by any command id between
   // |command_id_first| and |command_id_last| (inclusive) is present in the
   // menu.
   bool IsItemInRangePresent(int command_id_first, int command_id_last);
@@ skipping 18 matching lines @@
 
   using RenderViewContextMenu::AppendImageItems;
 
   void Show() override;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TestRenderViewContextMenu);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_CONTEXT_MENU_RENDER_VIEW_CONTEXT_MENU_TEST_UTIL_H_