Deprecate NonThreadSafe in remoting in favor of SequenceChecker.

remoting/protocol/session_manager.h

Index: remoting/protocol/session_manager.h
diff --git a/remoting/protocol/session_manager.h b/remoting/protocol/session_manager.h
index b8cd08f03114a573dc8b0e1e60b258ddd530de49..827d436f221b5d5058a6e45b169bc7145e423901 100644
--- a/remoting/protocol/session_manager.h
+++ b/remoting/protocol/session_manager.h
@@ -57,7 +57,6 @@
 
 #include "base/callback.h"
 #include "base/macros.h"
-#include "base/threading/non_thread_safe.h"
 #include "remoting/protocol/session.h"
 
 namespace remoting {
@@ -71,7 +70,7 @@ class Authenticator;
 class AuthenticatorFactory;
 
 // Generic interface for Chromoting session manager.
-class SessionManager : public base::NonThreadSafe {
+class SessionManager {
  public:
   enum IncomingSessionResponse {
     // Accept the session.