Replace deprecated base::NonThreadSafe in content/renderer/media/webrtc in favor of SequenceChecker.

content/renderer/media/webrtc/peer_connection_dependency_factory.cc

Index: content/renderer/media/webrtc/peer_connection_dependency_factory.cc
diff --git a/content/renderer/media/webrtc/peer_connection_dependency_factory.cc b/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
index dfb40366c5b47e9c77652d9974d2345605f10dbf..963de652a3970586c0825713f2d86e0fcd5f49c5 100644
--- a/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
+++ b/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
@@ -114,6 +114,7 @@ PeerConnectionDependencyFactory::PeerConnectionDependencyFactory(
 }
 
 PeerConnectionDependencyFactory::~PeerConnectionDependencyFactory() {
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   DVLOG(1) << "~PeerConnectionDependencyFactory()";
   DCHECK(!pc_factory_);
 }
@@ -443,7 +444,7 @@ PeerConnectionDependencyFactory::CreateIceCandidate(
 
 WebRtcAudioDeviceImpl*
 PeerConnectionDependencyFactory::GetWebRtcAudioDevice() {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   EnsureWebRtcAudioDeviceImpl();
   return audio_device_.get();
 }
@@ -534,27 +535,27 @@ void PeerConnectionDependencyFactory::CleanupPeerConnectionFactory() {
 }
 
 void PeerConnectionDependencyFactory::EnsureInitialized() {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   GetPcFactory();
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 PeerConnectionDependencyFactory::GetWebRtcWorkerThread() const {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   return chrome_worker_thread_.IsRunning() ? chrome_worker_thread_.task_runner()
                                            : nullptr;
 }
 
 scoped_refptr<base::SingleThreadTaskRunner>
 PeerConnectionDependencyFactory::GetWebRtcSignalingThread() const {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   return chrome_signaling_thread_.IsRunning()
              ? chrome_signaling_thread_.task_runner()
              : nullptr;
 }
 
 void PeerConnectionDependencyFactory::EnsureWebRtcAudioDeviceImpl() {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   if (audio_device_.get())
     return;