Remove #pragma once from content

content/public/browser/zygote_host_linux.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_PUBLIC_BROWSER_ZYGOTE_HOST_LINUX_H_
 #define CONTENT_PUBLIC_BROWSER_ZYGOTE_HOST_LINUX_H_
-#pragma once
 
 #include <unistd.h>
 
 #include "base/process.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 // http://code.google.com/p/chromium/wiki/LinuxZygote
 
@@ skipping 23 matching lines @@
   // Adjust the point at which the low memory notifier in the kernel tells
   // us that we're low on memory.  When there is less than |margin_mb| left,
   // then the notifier will notify us.  Set |margin_mb| to -1 to turn off
   // low memory notification altogether.
   virtual void AdjustLowMemoryMargin(int64 margin_mb) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_ZYGOTE_HOST_LINUX_H_