Remove #pragma once from content

content/public/browser/speech_recognition_preferences.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 CONTENT_PUBLIC_BROWSER_SPEECH_RECOGNITION_PREFERENCES_H_
 #define CONTENT_PUBLIC_BROWSER_SPEECH_RECOGNITION_PREFERENCES_H_
-#pragma once
 
 #include "base/memory/ref_counted.h"
 
 namespace content {
 
 class SpeechRecognitionPreferences
     : public base::RefCountedThreadSafe<SpeechRecognitionPreferences> {
  public:
   virtual bool FilterProfanities() const = 0;
 
  protected:
   virtual ~SpeechRecognitionPreferences() {}
 
  private:
   friend class base::RefCountedThreadSafe<SpeechRecognitionPreferences>;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_SPEECH_RECOGNITION_PREFERENCES_H_