Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/updater/extension_downloader.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_UPDATER_EXTENSION_DOWNLOADER_H_
 #define CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_DOWNLOADER_H_
-#pragma once
 
 #include <deque>
 #include <map>
 #include <set>
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 179 matching lines @@
 
   // Maps an extension-id to its PingResult data.
   std::map<std::string, ExtensionDownloaderDelegate::PingResult> ping_results_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionDownloader);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_UPDATER_EXTENSION_DOWNLOADER_H_