Deprecate NonThreadSafe in remoting in favor of SequenceChecker.

remoting/host/setup/win/auth_code_getter.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef REMOTING_HOST_SETUP_WIN_AUTH_CODE_GETTER_H
 #define REMOTING_HOST_SETUP_WIN_AUTH_CODE_GETTER_H
 
 #include <ole2.h>
 #include <exdisp.h>
 
 #include <string>
 
 #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();
 
   // Starts a browser and navigates it to a URL that starts an Installed
   // Application OAuth flow. |on_auth_code| will be called with an
   // authorization code, or an empty string on error.
   void GetAuthCode(base::Callback<void(const std::string&)> on_auth_code);
 
  private:
   // Starts a timer used to poll the browser's URL.
   void StartTimer();
   // Called when that timer fires.
   void OnTimer();
   // Returns whether to stop polling the browser's URL. If true, then
   // |auth_code| is an authorization code, or the empty string on an error.
   bool TestBrowserUrl(std::string* auth_code);
   // Kills the browser.
   void KillBrowser();
 
   // The authorization code callback.
   base::Callback<void(const std::string&)> on_auth_code_;
   // The browser through which the user requests an authorization code.
   base::win::ScopedComPtr<IWebBrowser2> browser_;
   // A timer used to poll the browser's URL.
   base::OneShotTimer timer_;
   // The interval at which the timer fires.
   base::TimeDelta timer_interval_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(AuthCodeGetter);
 };
 
 }  // namespace remoting
 
 #endif  // REMOTING_HOST_SETUP_WIN_AUTH_CODE_GETTER_H