Remove #pragma once from chrome/browser/extensions

chrome/browser/extensions/extension_font_settings_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.
 
 // Defines the classes to realize the Font Settings Extension API as specified
 // in the extension API JSON.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_FONT_SETTINGS_API_H__
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_FONT_SETTINGS_API_H__
-#pragma once
 
 #include <map>
 #include <string>
 #include <utility>
 
 #include "chrome/browser/extensions/extension_function.h"
 #include "chrome/browser/prefs/pref_change_registrar.h"
 
 // This class observes pref changed events on a profile and dispatches the
 // corresponding extension API events to extensions.
@@ skipping 278 matching lines @@
 
  protected:
   virtual ~SetMinimumFontSizeFunction() {}
 
   // SetFontPrefExtensionFunction:
   virtual const char* GetPrefName() OVERRIDE;
   virtual const char* GetKey() OVERRIDE;
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_FONT_SETTINGS_API_H__