Move AcceleratorController from WmShell to Shell

chrome/browser/ui/browser_commands_chromeos.cc

 // Copyright 2015 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/browser_commands_chromeos.h"
 
 #include "ash/accelerators/accelerator_controller_delegate_aura.h"
+#include "ash/aura/wm_shell_aura.h"
 #include "ash/metrics/user_metrics_recorder.h"
 #include "ash/screenshot_delegate.h"
-#include "ash/shell.h"
 #include "base/metrics/user_metrics_action.h"
 #include "content/public/browser/user_metrics.h"
 
 using base::UserMetricsAction;
 
 void TakeScreenshot() {
   content::RecordAction(UserMetricsAction("Menu_Take_Screenshot"));
   ash::ScreenshotDelegate* screenshot_delegate =
-      ash::Shell::GetInstance()
+      ash::WmShellAura::Get()
           ->accelerator_controller_delegate()
           ->screenshot_delegate();
   if (screenshot_delegate &&
       screenshot_delegate->CanTakeScreenshot()) {
     screenshot_delegate->HandleTakeScreenshotForAllRootWindows();
   }
 }