Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/extension_install_ui_android.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_INSTALL_UI_ANDROID_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_INSTALL_UI_ANDROID_H_
-#pragma once
 
 #include "chrome/browser/extensions/extension_install_ui.h"
 
 class ExtensionInstallUIAndroid : public ExtensionInstallUI {
  public:
   ExtensionInstallUIAndroid();
   virtual ~ExtensionInstallUIAndroid();
 
   // ExtensionInstallUI implementation:
   virtual void OnInstallSuccess(const extensions::Extension* extension,
                                 SkBitmap* icon);
   virtual void OnInstallFailure(const CrxInstallerError& error);
   virtual void SetSkipPostInstallUI(bool skip_ui);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ExtensionInstallUIAndroid);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_INSTALL_UI_ANDROID_H_