Remove #pragma once from content

content/browser/renderer_host/backing_store_mac.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 CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_MAC_H_
 #define CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_MAC_H_
-#pragma once
 
 #include "base/basictypes.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "content/browser/renderer_host/backing_store.h"
 
 class BackingStoreMac : public BackingStore {
  public:
   // |size| is in view units, |device_scale_factor| is the backingScaleFactor.
   // The pixel size of the backing store is size.Scale(device_scale_factor).
   BackingStoreMac(content::RenderWidgetHost* widget,
@@ skipping 46 matching lines @@
   base::mac::ScopedCFTypeRef<CGContextRef> cg_bitmap_;
   base::mac::ScopedCFTypeRef<CGLayerRef> cg_layer_;
 
   // Number of physical pixels per view unit. This is 1 or 2 in practice.
   float device_scale_factor_;
 
   DISALLOW_COPY_AND_ASSIGN(BackingStoreMac);
 };
 
 #endif  // CONTENT_BROWSER_RENDERER_HOST_BACKING_STORE_MAC_H_