Remove #pragma once from ash

ash/shell_window_ids.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_WINDOW_IDS_H_
 #define ASH_SHELL_WINDOW_IDS_H_
-#pragma once
 
 // Declarations of ids of special shell windows.
 
 namespace ash {
 
 namespace internal {
 
 // A higher-level container that holds all of the containers stacked below
 // kShellWindowId_LockScreenContainer.  Only used by PowerButtonController for
 // animating lower-level containers.
@@ skipping 62 matching lines @@
 // The container for special components overlaid onscreen, such as the
 // region selector for partial screenshots.
 const int kShellWindowId_OverlayContainer = 18;
 
 }  // namespace internal
 
 }  // namespace ash
 
 
 #endif  // ASH_SHELL_WINDOW_IDS_H_