Replaced CriticalSectionWrapper with rtc::CriticalSection in rtp_rtcp module

webrtc/modules/rtp_rtcp/source/rtp_receiver_strategy.cc

 /*
  *  Copyright (c) 2012 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.
  */
 
 #include "webrtc/modules/rtp_rtcp/source/rtp_receiver_strategy.h"
 
 #include <stdlib.h>
 
-#include "webrtc/system_wrappers/include/critical_section_wrapper.h"
-
 namespace webrtc {
 
 RTPReceiverStrategy::RTPReceiverStrategy(RtpData* data_callback)
-    : crit_sect_(CriticalSectionWrapper::CreateCriticalSection()),
-      data_callback_(data_callback) {
+    : data_callback_(data_callback) {
   memset(&last_payload_, 0, sizeof(last_payload_));
 }
 
 void RTPReceiverStrategy::GetLastMediaSpecificPayload(
     PayloadUnion* payload) const {
-  CriticalSectionScoped cs(crit_sect_.get());
+  rtc::CritScope cs(&crit_sect_);
   memcpy(payload, &last_payload_, sizeof(*payload));
 }
 
 void RTPReceiverStrategy::SetLastMediaSpecificPayload(
     const PayloadUnion& payload) {
-  CriticalSectionScoped cs(crit_sect_.get());
+  rtc::CritScope cs(&crit_sect_);
   memcpy(&last_payload_, &payload, sizeof(last_payload_));
 }
 
 void RTPReceiverStrategy::CheckPayloadChanged(int8_t payload_type,
                                               PayloadUnion* specific_payload,
                                               bool* should_discard_changes) {
   // Default: Keep changes.
   *should_discard_changes = false;
 }
 
 int RTPReceiverStrategy::Energy(uint8_t array_of_energy[kRtpCsrcSize]) const {
   return -1;
 }
 
 }  // namespace webrtc