Replaced CriticalSectionWrapper with rtc::CriticalSection in rtp_rtcp module

webrtc/modules/rtp_rtcp/source/rtp_receiver_strategy.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_receiver_strategy.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_receiver_strategy.cc b/webrtc/modules/rtp_rtcp/source/rtp_receiver_strategy.cc
index 3797b1bcc20e6907b9341fb3cf6611c1650a4974..69d079f9aa30f7036642275ba5c9b86fc30b9eed 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_receiver_strategy.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_receiver_strategy.cc
@@ -12,25 +12,22 @@
 
 #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_));
 }