Remove thread checker from CongestionController.

webrtc/modules/congestion_controller/congestion_controller.cc

Index: webrtc/modules/congestion_controller/congestion_controller.cc
diff --git a/webrtc/modules/congestion_controller/congestion_controller.cc b/webrtc/modules/congestion_controller/congestion_controller.cc
index f9e7e018e517e1c4b1a24f8b59cf87681c27b3d8..aafab663b7b33420f1bc908cd36428bb433175ad 100644
--- a/webrtc/modules/congestion_controller/congestion_controller.cc
+++ b/webrtc/modules/congestion_controller/congestion_controller.cc
@@ -168,7 +168,6 @@ CongestionController::~CongestionController() {
 void CongestionController::SetBweBitrates(int min_bitrate_bps,
                                           int start_bitrate_bps,
                                           int max_bitrate_bps) {
-  RTC_DCHECK(config_thread_checker_.CalledOnValidThread());
   // TODO(holmer): We should make sure the default bitrates are set to 10 kbps,
   // and that we don't try to set the min bitrate to 0 from any applications.
   // The congestion controller should allow a min bitrate of 0.
@@ -204,7 +203,6 @@ RemoteBitrateEstimator* CongestionController::GetRemoteBitrateEstimator(
 
 TransportFeedbackObserver*
 CongestionController::GetTransportFeedbackObserver() {
-  RTC_DCHECK(config_thread_checker_.CalledOnValidThread());
   return &transport_feedback_adapter_;
 }