Remove duplicated headers from platform/

Source/platform/mediastream/RTCDTMFSenderHandler.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY GOOGLE INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL GOOGLE INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
 #include "platform/mediastream/RTCDTMFSenderHandler.h"
 
-#include "platform/mediastream/RTCDTMFSenderHandlerClient.h"
-#include "public/platform/WebRTCDTMFSenderHandler.h"
-#include "wtf/PassOwnPtr.h"
 
 using namespace blink;
 
 namespace WebCore {
 
 PassOwnPtr<RTCDTMFSenderHandler> RTCDTMFSenderHandler::create(WebRTCDTMFSenderHandler* webHandler)
 {
     return adoptPtr(new RTCDTMFSenderHandler(webHandler));
 }
 
@@ skipping 28 matching lines @@
     return m_webHandler->insertDTMF(tones, duration, interToneGap);
 }
 
 void RTCDTMFSenderHandler::didPlayTone(const WebString& tone) const
 {
     if (m_client)
         m_client->didPlayTone(tone);
 }
 
 } // namespace WebCore