Deprecate NonThreadSafe in remoting in favor of SequenceChecker.

remoting/protocol/jingle_session_manager.cc

Index: remoting/protocol/jingle_session_manager.cc
diff --git a/remoting/protocol/jingle_session_manager.cc b/remoting/protocol/jingle_session_manager.cc
index c13cdb091a5c733f6981bd3213f23edadcb22c13..b4eebebbf64b8f01e88e0581b0f2ddaa9fef7ec8 100644
--- a/remoting/protocol/jingle_session_manager.cc
+++ b/remoting/protocol/jingle_session_manager.cc
@@ -56,7 +56,7 @@ std::unique_ptr<Session> JingleSessionManager::Connect(
 
 void JingleSessionManager::set_authenticator_factory(
     std::unique_ptr<AuthenticatorFactory> authenticator_factory) {
-  DCHECK(CalledOnValidThread());
+  DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
   authenticator_factory_ = std::move(authenticator_factory);
 }