AcceleratorProvider: Make GetAcceleratorForCommandId const.

chrome/browser/ui/ash/launcher/launcher_application_menu_item_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/ash/launcher/launcher_application_menu_item_model.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/metrics/histogram_macros.h"
@@ skipping 30 matching lines @@
 }
 
 bool LauncherApplicationMenuItemModel::IsCommandIdEnabled(
     int command_id) const {
   DCHECK(command_id < static_cast<int>(launcher_items_.size()));
   return launcher_items_[command_id]->IsEnabled();
 }
 
 bool LauncherApplicationMenuItemModel::GetAcceleratorForCommandId(
     int command_id,
-    ui::Accelerator* accelerator) {
+    ui::Accelerator* accelerator) const {
   return false;
 }
 
 void LauncherApplicationMenuItemModel::ExecuteCommand(int command_id,
                                                       int event_flags) {
   DCHECK(command_id < static_cast<int>(launcher_items_.size()));
   launcher_items_[command_id]->Execute(event_flags);
   RecordMenuItemSelectedMetrics(command_id, GetNumMenuItemsEnabled());
 }
 
@@ skipping 27 matching lines @@
   return num_menu_items_enabled;
 }
 
 void LauncherApplicationMenuItemModel::RecordMenuItemSelectedMetrics(
     int command_id,
     int num_menu_items_enabled) {
   UMA_HISTOGRAM_COUNTS_100(kSelectedMenuItemIndexHistogramName, command_id);
   UMA_HISTOGRAM_COUNTS_100(kNumItemsEnabledHistogramName,
                            num_menu_items_enabled);
 }