Replace SequencedTaskChecker in RTPSenderVideo

webrtc/modules/rtp_rtcp/source/rtp_sender_video.h

Index: webrtc/modules/rtp_rtcp/source/rtp_sender_video.h
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_sender_video.h b/webrtc/modules/rtp_rtcp/source/rtp_sender_video.h
index 56167eb6ebfc1ed7871c23e0dc017732054c653d..668c417981051b187ee8d9029de042e315cbd4f8 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_sender_video.h
+++ b/webrtc/modules/rtp_rtcp/source/rtp_sender_video.h
@@ -55,8 +55,6 @@ class RTPSenderVideo {
                  const RTPFragmentationHeader* fragmentation,
                  const RTPVideoHeader* video_header);
 
-  int32_t SendRTPIntraRequest();
-
   void SetVideoCodecType(RtpVideoCodecTypes type);
 
   // ULPFEC.
@@ -93,11 +91,10 @@ class RTPSenderVideo {
 
   // Should never be held when calling out of this class.
   rtc::CriticalSection crit_;
-  rtc::SequencedTaskChecker encoder_checker_;
 
   RtpVideoCodecTypes video_type_;
   int32_t retransmission_settings_ GUARDED_BY(crit_);
-  VideoRotation last_rotation_ GUARDED_BY(encoder_checker_);
+  VideoRotation last_rotation_ GUARDED_BY(crit_);
 
   // RED/ULPFEC.
   int red_payload_type_ GUARDED_BY(crit_);