Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/extension_host.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 CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_
-#pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/perftimer.h"
 #include "chrome/browser/extensions/extension_function_dispatcher.h"
 #include "chrome/common/view_type.h"
 #include "content/public/browser/javascript_dialogs.h"
@@ skipping 232 matching lines @@
   // The relevant WebContents associated with this ExtensionHost, if any.
   content::WebContents* associated_web_contents_;
 
   // Used to measure how long it's been since the host was created.
   PerfTimer since_created_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionHost);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_HOST_H_