Deprecate NonThreadSafe in remoting in favor of SequenceChecker.

remoting/host/setup/win/auth_code_getter.h

Index: remoting/host/setup/win/auth_code_getter.h
diff --git a/remoting/host/setup/win/auth_code_getter.h b/remoting/host/setup/win/auth_code_getter.h
index b4a575670f5009e152be96bff69a928d4932a01f..22aa0534f9f140d0f7a8a1b3234e02ecc5b12831 100644
--- a/remoting/host/setup/win/auth_code_getter.h
+++ b/remoting/host/setup/win/auth_code_getter.h
@@ -12,14 +12,14 @@
 
 #include "base/callback.h"
 #include "base/macros.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 #include "base/timer/timer.h"
 #include "base/win/scoped_comptr.h"
 
 namespace remoting {
 
 // A class for getting an OAuth authorization code.
-class AuthCodeGetter : public base::NonThreadSafe {
+class AuthCodeGetter {
  public:
   AuthCodeGetter();
   ~AuthCodeGetter();
@@ -49,6 +49,8 @@ class AuthCodeGetter : public base::NonThreadSafe {
   // The interval at which the timer fires.
   base::TimeDelta timer_interval_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(AuthCodeGetter);
 };