Replaced CriticalSectionWrapper with rtc::CriticalSection in rtp_rtcp module

webrtc/modules/rtp_rtcp/source/dtmf_queue.h

 /*
  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
 #ifndef WEBRTC_MODULES_RTP_RTCP_SOURCE_DTMF_QUEUE_H_
 #define WEBRTC_MODULES_RTP_RTCP_SOURCE_DTMF_QUEUE_H_
 
+#include "webrtc/base/criticalsection.h"
 #include "webrtc/modules/rtp_rtcp/source/rtp_rtcp_config.h"
-#include "webrtc/system_wrappers/include/critical_section_wrapper.h"
 #include "webrtc/typedefs.h"
 
 namespace webrtc {
 class DTMFqueue {
  public:
   DTMFqueue();
   virtual ~DTMFqueue();
 
   int32_t AddDTMF(uint8_t dtmf_key, uint16_t len, uint8_t level);
   int8_t NextDTMF(uint8_t* dtmf_key, uint16_t* len, uint8_t* level);
   bool PendingDTMF();
   void ResetDTMF();
 
  private:
-  CriticalSectionWrapper* dtmf_critsect_;
+  rtc::CriticalSection dtmf_critsect_;
   uint8_t next_empty_index_;
   uint8_t dtmf_key_[DTMF_OUTBAND_MAX];
   uint16_t dtmf_length[DTMF_OUTBAND_MAX];
   uint8_t dtmf_level_[DTMF_OUTBAND_MAX];
 };
 }  // namespace webrtc
 
 #endif  // WEBRTC_MODULES_RTP_RTCP_SOURCE_DTMF_QUEUE_H_