Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/extension_install_dialog.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_DIALOG_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_INSTALL_DIALOG_H_
-#pragma once
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "base/string16.h"
 #include "chrome/browser/extensions/extension_install_prompt.h"
 
 namespace base {
 class DictionaryValue;
 }
 
 void ShowExtensionInstallDialog(gfx::NativeWindow parent,
                                 content::PageNavigator* navigator,
                                 ExtensionInstallPrompt::Delegate* delegate,
                                 const ExtensionInstallPrompt::Prompt& prompt);
 
 // The implementations of this function are platform-specific.
 void ShowExtensionInstallDialogImpl(
     gfx::NativeWindow parent,
     content::PageNavigator* navigator,
     ExtensionInstallPrompt::Delegate* delegate,
     const ExtensionInstallPrompt::Prompt& prompt);
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_INSTALL_DIALOG_H_