Replace deprecated base::NonThreadSafe in chrome/service in favor of SequenceChecker.

chrome/service/cloud_print/cloud_print_token_store.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 CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_TOKEN_STORE_H_
 #define CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_TOKEN_STORE_H_
 
 #include <string>
 #include "base/logging.h"
 #include "base/macros.h"
-#include "base/threading/non_thread_safe.h"
+#include "base/sequence_checker.h"
 
 // This class serves as the single repository for cloud print auth tokens. This
 // is only used within the CloudPrintProxyCoreThread.
 
 namespace cloud_print {
 
-class CloudPrintTokenStore : public base::NonThreadSafe {
+class CloudPrintTokenStore {
  public:
   // Returns the CloudPrintTokenStore instance for this thread. Will be NULL
   // if no instance was created in this thread before.
   static CloudPrintTokenStore* current();
 
   CloudPrintTokenStore();
   ~CloudPrintTokenStore();
 
   void SetToken(const std::string& token);
   std::string token() const {
-    DCHECK(CalledOnValidThread());
+    DCHECK_CALLED_ON_VALID_SEQUENCE(sequence_checker_);
     return token_;
   }
 
  private:
   std::string token_;
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
   DISALLOW_COPY_AND_ASSIGN(CloudPrintTokenStore);
 };
 
 }  // namespace cloud_print
 
 #endif  // CHROME_SERVICE_CLOUD_PRINT_CLOUD_PRINT_TOKEN_STORE_H_