AcceleratorProvider: Make GetAcceleratorForCommandId const.

chrome/browser/ui/views/frame/system_menu_model_delegate.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/views/frame/system_menu_model_delegate.h"
 
 #include "chrome/app/chrome_command_ids.h"
 #include "chrome/browser/command_updater.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/tab_restore_service_factory.h"
@@ skipping 41 matching lines @@
   // TODO(sky): add a way to update menu.
   sessions::TabRestoreService* trs =
       TabRestoreServiceFactory::GetForProfile(browser_->profile());
   if (!trs->IsLoaded()) {
     trs->LoadTabsFromLastSession();
     return false;
   }
   return true;
 }
 
-bool SystemMenuModelDelegate::GetAcceleratorForCommandId(int command_id,
-                                             ui::Accelerator* accelerator) {
+bool SystemMenuModelDelegate::GetAcceleratorForCommandId(
+    int command_id,
+    ui::Accelerator* accelerator) const {
   return provider_->GetAcceleratorForCommandId(command_id, accelerator);
 }
 
 bool SystemMenuModelDelegate::IsItemForCommandIdDynamic(int command_id) const {
   return command_id == IDC_RESTORE_TAB;
 }
 
 base::string16 SystemMenuModelDelegate::GetLabelForCommandId(
     int command_id) const {
   DCHECK_EQ(command_id, IDC_RESTORE_TAB);
 
   int string_id = IDS_RESTORE_TAB;
   if (IsCommandIdEnabled(command_id)) {
     sessions::TabRestoreService* trs =
         TabRestoreServiceFactory::GetForProfile(browser_->profile());
     trs->LoadTabsFromLastSession();
     if (trs && !trs->entries().empty() &&
         trs->entries().front()->type == sessions::TabRestoreService::WINDOW)
       string_id = IDS_RESTORE_WINDOW;
   }
   return l10n_util::GetStringUTF16(string_id);
 }
 
 void SystemMenuModelDelegate::ExecuteCommand(int command_id, int event_flags) {
   chrome::ExecuteCommand(browser_, command_id);
 }