Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/extension_input_api.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_INPUT_API_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_INPUT_API_H_
-#pragma once
 
 #include "base/compiler_specific.h"
 #include "chrome/browser/extensions/extension_function.h"
 
 // Note that this experimental API is currently only available for
 // TOOLKIT_VIEWS (see chrome/chrome_browser.gypi).
 //
 // We may eventually support other platforms by adding the necessary
 // synthetic event distribution code to this Function.
 class SendKeyboardEventInputFunction : public SyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION_NAME(
       "experimental.input.virtualKeyboard.sendKeyboardEvent");
 
  protected:
   virtual ~SendKeyboardEventInputFunction() {}
 
   // ExtensionFunction:
   virtual bool RunImpl() OVERRIDE;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_INPUT_API_H_