AcceleratorProvider: Make GetAcceleratorForCommandId const.

ash/sysui/context_menu_mus.cc

 // Copyright 2016 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 "ash/sysui/context_menu_mus.h"
 
 #include "ash/common/shelf/shelf_types.h"
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/desktop_background/user_wallpaper_delegate.h"
 #include "ash/shell.h"
@@ skipping 23 matching lines @@
   return false;
 }
 
 bool ContextMenuMus::IsCommandIdEnabled(int command_id) const {
   Shell* shell = Shell::GetInstance();
   if (command_id == MENU_CHANGE_WALLPAPER)
     return shell->user_wallpaper_delegate()->CanOpenSetWallpaperPage();
   return true;
 }
 
-bool ContextMenuMus::GetAcceleratorForCommandId(int command_id,
-                                                ui::Accelerator* accelerator) {
+bool ContextMenuMus::GetAcceleratorForCommandId(
+    int command_id,
+    ui::Accelerator* accelerator) const {
   return false;
 }
 
 void ContextMenuMus::ExecuteCommand(int command_id, int event_flags) {
   if (command_id == MENU_AUTO_HIDE) {
     wm_shelf_->SetAutoHideBehavior(wm_shelf_->GetAutoHideBehavior() ==
                                            SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS
                                        ? SHELF_AUTO_HIDE_BEHAVIOR_NEVER
                                        : SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS);
   } else if (command_id == MENU_CHANGE_WALLPAPER) {
     Shell::GetInstance()->user_wallpaper_delegate()->OpenSetWallpaperPage();
   }
 }
 
 }  // namespace ash