Replaced CriticalSectionWrapper with rtc::CriticalSection in rtp_rtcp module

webrtc/modules/rtp_rtcp/source/bitrate.cc

Index: webrtc/modules/rtp_rtcp/source/bitrate.cc
diff --git a/webrtc/modules/rtp_rtcp/source/bitrate.cc b/webrtc/modules/rtp_rtcp/source/bitrate.cc
index 4e9fc72c1f8ae79f4f2f631b3841848e581bccca..49a23592bfe8c4a988835f0ca09a211f62f8fbdf 100644
--- a/webrtc/modules/rtp_rtcp/source/bitrate.cc
+++ b/webrtc/modules/rtp_rtcp/source/bitrate.cc
@@ -11,13 +11,11 @@
 #include "webrtc/modules/rtp_rtcp/source/bitrate.h"
 
 #include "webrtc/modules/rtp_rtcp/source/rtp_utility.h"
-#include "webrtc/system_wrappers/include/critical_section_wrapper.h"
 
 namespace webrtc {
 
 Bitrate::Bitrate(Clock* clock, Observer* observer)
     : clock_(clock),
-      crit_(CriticalSectionWrapper::CreateCriticalSection()),
       packet_rate_(0),
       bitrate_(0),
       bitrate_next_idx_(0),
@@ -33,23 +31,23 @@ Bitrate::Bitrate(Clock* clock, Observer* observer)
 Bitrate::~Bitrate() {}
 
 void Bitrate::Update(const size_t bytes) {
-  CriticalSectionScoped cs(crit_.get());
+  rtc::CritScope cs(&crit_);
   bytes_count_ += bytes;
   packet_count_++;
 }
 
 uint32_t Bitrate::PacketRate() const {
-  CriticalSectionScoped cs(crit_.get());
+  rtc::CritScope cs(&crit_);
   return packet_rate_;
 }
 
 uint32_t Bitrate::BitrateLast() const {
-  CriticalSectionScoped cs(crit_.get());
+  rtc::CritScope cs(&crit_);
   return bitrate_;
 }
 
 uint32_t Bitrate::BitrateNow() const {
-  CriticalSectionScoped cs(crit_.get());
+  rtc::CritScope cs(&crit_);
   int64_t now = clock_->TimeInMilliseconds();
   int64_t diff_ms = now - time_last_rate_update_;
 
@@ -67,7 +65,7 @@ uint32_t Bitrate::BitrateNow() const {
 }
 
 int64_t Bitrate::time_last_rate_update() const {
-  CriticalSectionScoped cs(crit_.get());
+  rtc::CritScope cs(&crit_);
   return time_last_rate_update_;
 }
 
@@ -75,7 +73,7 @@ int64_t Bitrate::time_last_rate_update() const {
 void Bitrate::Process() {
   BitrateStatistics stats;
   {
-    CriticalSectionScoped cs(crit_.get());
+    rtc::CritScope cs(&crit_);
     int64_t now = clock_->CurrentNtpInMilliseconds();
     int64_t diff_ms = now - time_last_rate_update_;