Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/extension_apitest.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_APITEST_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_APITEST_H_
-#pragma once
 
 #include <deque>
 #include <string>
 
 #include "base/compiler_specific.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "content/public/browser/notification_registrar.h"
 
 class FilePath;
@@ skipping 159 matching lines @@
 // apps (if any).
 class PlatformAppApiTest : public ExtensionApiTest {
  public:
   PlatformAppApiTest();
   virtual ~PlatformAppApiTest();
 
   virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_APITEST_H_