Deprecate NonThreadSafe in remoting in favor of SequenceChecker.

remoting/signaling/log_to_server.cc

Index: remoting/signaling/log_to_server.cc
diff --git a/remoting/signaling/log_to_server.cc b/remoting/signaling/log_to_server.cc
index 5e05acec5ec6ea0759e6f98675e38d61d4c31f73..97f89890f73211c6db64432bd0c0653bbab1f9dc 100644
--- a/remoting/signaling/log_to_server.cc
+++ b/remoting/signaling/log_to_server.cc
@@ -27,11 +27,12 @@ LogToServer::LogToServer(ServerLogEntry::Mode mode,
 }
 
 LogToServer::~LogToServer() {
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   signal_strategy_->RemoveListener(this);
 }
 
 void LogToServer::OnSignalStrategyStateChange(SignalStrategy::State state) {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
 
   if (state == SignalStrategy::CONNECTED) {
     iq_sender_.reset(new IqSender(signal_strategy_));