AcceleratorProvider: Make GetAcceleratorForCommandId const.

chrome/browser/ui/website_settings/permission_menu_model.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_WEBSITE_SETTINGS_PERMISSION_MENU_MODEL_H_
 #define CHROME_BROWSER_UI_WEBSITE_SETTINGS_PERMISSION_MENU_MODEL_H_
 
 #include "base/macros.h"
 #include "chrome/browser/ui/website_settings/website_settings_ui.h"
 #include "components/content_settings/core/common/content_settings.h"
@@ skipping 17 matching lines @@
   // CONTENT_SETTING_BLOCK.
   PermissionMenuModel(const GURL& url,
                       ContentSetting setting,
                       const ChangeCallback& callback);
   ~PermissionMenuModel() override;
 
   // Overridden from ui::SimpleMenuModel::Delegate:
   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;
 
  private:
   // The permission info represented by the menu model.
   WebsiteSettingsUI::PermissionInfo permission_;
 
   // Callback to be called when the permission's setting is changed.
   ChangeCallback callback_;
 
   DISALLOW_COPY_AND_ASSIGN(PermissionMenuModel);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBSITE_SETTINGS_PERMISSION_MENU_MODEL_H_