Replaced CriticalSectionWrapper with rtc::CriticalSection in rtp_rtcp module

webrtc/modules/rtp_rtcp/source/rtp_sender.h

Index: webrtc/modules/rtp_rtcp/source/rtp_sender.h
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_sender.h b/webrtc/modules/rtp_rtcp/source/rtp_sender.h
index 4344df67451a28f411fc60ed0a71a261523e3e51..df75f112c28e23ed9101a4e63c3827c7b37c2ee9 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_sender.h
+++ b/webrtc/modules/rtp_rtcp/source/rtp_sender.h
@@ -454,7 +454,7 @@ class RTPSender : public RTPSenderInterface {
   RTPPacketHistory packet_history_;
 
   // Statistics
-  rtc::scoped_ptr<CriticalSectionWrapper> statistics_crit_;
+  rtc::CriticalSection statistics_crit_;
   SendDelayMap send_delays_ GUARDED_BY(statistics_crit_);
   FrameCounts frame_counts_ GUARDED_BY(statistics_crit_);
   StreamDataCounters rtp_stats_ GUARDED_BY(statistics_crit_);
@@ -489,7 +489,7 @@ class RTPSender : public RTPSenderInterface {
   // SetTargetBitrateKbps or GetTargetBitrateKbps. Also remember
   // that by the time the function returns there is no guarantee
   // that the target bitrate is still valid.
-  rtc::scoped_ptr<CriticalSectionWrapper> target_bitrate_critsect_;
+  rtc::CriticalSection target_bitrate_critsect_;
   uint32_t target_bitrate_ GUARDED_BY(target_bitrate_critsect_);
 
   RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(RTPSender);