Remove #pragma once from ash

ash/shell/shell_delegate_impl.h

 // 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.
 
 #ifndef ASH_SHELL_SHELL_DELEGATE_IMPL_H_
 #define ASH_SHELL_SHELL_DELEGATE_IMPL_H_
-#pragma once
 
 #include "ash/shell_delegate.h"
 #include "base/compiler_specific.h"
 
 namespace ash {
 namespace shell {
 
 class LauncherDelegateImpl;
 class WindowWatcher;
 
@@ skipping 41 matching lines @@
   bool locked_;
   bool spoken_feedback_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellDelegateImpl);
 };
 
 }  // namespace shell
 }  // namespace ash
 
 #endif  // ASH_SHELL_SHELL_DELEGATE_IMPL_H_