Deprecate NonThreadSafe in remoting in favor of SequenceChecker.

remoting/host/client_session.h

Index: remoting/host/client_session.h
diff --git a/remoting/host/client_session.h b/remoting/host/client_session.h
index 55e06d1f7f4afc00de76e1480228f27c89ae15c5..24440d8ad6f9849b1e064c0c6bee56bc5d54e3d3 100644
--- a/remoting/host/client_session.h
+++ b/remoting/host/client_session.h
@@ -12,8 +12,8 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
+#include "base/sequence_checker.h"
 #include "base/sequenced_task_runner_helpers.h"
-#include "base/threading/non_thread_safe.h"
 #include "base/time/time.h"
 #include "base/timer/timer.h"
 #include "remoting/host/client_session_control.h"
@@ -50,8 +50,7 @@ class VideoLayout;
 
 // A ClientSession keeps a reference to a connection to a client, and maintains
 // per-client state.
-class ClientSession : public base::NonThreadSafe,
-                      public protocol::HostStub,
+class ClientSession : public protocol::HostStub,
                       public protocol::ConnectionToClient::EventHandler,
                       public protocol::VideoStream::Observer,
                       public ClientSessionControl,
@@ -248,6 +247,8 @@ class ClientSession : public base::NonThreadSafe,
 
   HostExperimentSessionPlugin host_experiment_session_plugin_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   // Used to disable callbacks to |this| once DisconnectSession() has been
   // called.
   base::WeakPtrFactory<ClientSessionControl> weak_factory_;