Replace rtc::ThreadChecker with webrtc::SequenceChecker

Bug: webrtc:12419
Change-Id: I825c014cc1c4b1dcba5ef300409d44859e971144
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/205002
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Tommi <tommi@webrtc.org>
Commit-Queue: Artem Titov <titovartem@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#33136}
diff --git a/modules/video_coding/video_coding_impl.cc b/modules/video_coding/video_coding_impl.cc
index 049695d..de29e2c 100644
--- a/modules/video_coding/video_coding_impl.cc
+++ b/modules/video_coding/video_coding_impl.cc
@@ -16,7 +16,7 @@
 #include "api/video/encoded_image.h"
 #include "modules/video_coding/include/video_codec_interface.h"
 #include "modules/video_coding/timing.h"
-#include "rtc_base/thread_checker.h"
+#include "rtc_base/synchronization/sequence_checker.h"
 #include "system_wrappers/include/clock.h"
 
 namespace webrtc {
@@ -105,7 +105,7 @@
   }
 
  private:
-  rtc::ThreadChecker construction_thread_;
+  SequenceChecker construction_thread_;
   const std::unique_ptr<VCMTiming> timing_;
   vcm::VideoReceiver receiver_;
 };