AcceleratorProvider: Make GetAcceleratorForCommandId const.

chrome/browser/ui/website_settings/permission_menu_model.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/website_settings/permission_menu_model.h"
 
 #include "chrome/grit/generated_resources.h"
 #include "components/content_settings/core/browser/plugins_field_trial.h"
 #include "content/public/common/origin_util.h"
 #include "ui/base/l10n/l10n_util.h"
@@ skipping 103 matching lines @@
 
   return setting == command_id;
 }
 
 bool PermissionMenuModel::IsCommandIdEnabled(int command_id) const {
   return true;
 }
 
 bool PermissionMenuModel::GetAcceleratorForCommandId(
     int command_id,
-    ui::Accelerator* accelerator) {
+    ui::Accelerator* accelerator) const {
   // Accelerators are not supported.
   return false;
 }
 
 void PermissionMenuModel::ExecuteCommand(int command_id, int event_flags) {
   permission_.setting = static_cast<ContentSetting>(command_id);
   callback_.Run(permission_);
 }