Move off of deprecated base::NonThreadSafe in device/

device/serial/serial_io_handler.h

 // Copyright 2014 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 DEVICE_SERIAL_SERIAL_IO_HANDLER_H_
 #define DEVICE_SERIAL_SERIAL_IO_HANDLER_H_
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/callback.h"
 #include "base/files/file.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "base/sequence_checker.h"
 #include "base/single_thread_task_runner.h"
-#include "base/threading/non_thread_safe.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "build/build_config.h"
 #include "device/serial/buffer.h"
 #include "device/serial/serial.mojom.h"
 
 namespace device {
 
 // Provides a simplified interface for performing asynchronous I/O on serial
 // devices by hiding platform-specific MessageLoop interfaces. Pending I/O
 // operations hold a reference to this object until completion so that memory
 // doesn't disappear out from under the OS.
-class SerialIoHandler : public base::NonThreadSafe,
-                        public base::RefCounted<SerialIoHandler> {
+class SerialIoHandler : public base::RefCounted<SerialIoHandler> {
  public:
   // Constructs an instance of some platform-specific subclass.
   static scoped_refptr<SerialIoHandler> Create(
       scoped_refptr<base::SingleThreadTaskRunner> file_thread_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> ui_thread_task_runner);
 
   typedef base::Callback<void(bool success)> OpenCompleteCallback;
 
   // Initiates an asynchronous Open of the device.
   virtual void Open(const std::string& port,
@@ skipping 158 matching lines @@
   base::SingleThreadTaskRunner* file_thread_task_runner() const {
     return file_thread_task_runner_.get();
   }
 
   base::SingleThreadTaskRunner* ui_thread_task_runner() const {
     return ui_thread_task_runner_.get();
   }
 
   const std::string& port() const { return port_; }
 
+  SEQUENCE_CHECKER(sequence_checker_);
+
  private:
   friend class base::RefCounted<SerialIoHandler>;
 
   void MergeConnectionOptions(const serial::ConnectionOptions& options);
 
   // Continues an Open operation on the FILE thread.
   void StartOpen(const std::string& port,
                  scoped_refptr<base::SingleThreadTaskRunner> io_task_runner);
 
   // Finalizes an Open operation (continued from StartOpen) on the IO thread.
@@ skipping 27 matching lines @@
   scoped_refptr<base::SingleThreadTaskRunner> ui_thread_task_runner_;
 
   std::string port_;
 
   DISALLOW_COPY_AND_ASSIGN(SerialIoHandler);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_SERIAL_SERIAL_IO_HANDLER_H_