Privatize StrongBinding lifetime management

device/serial/serial_connection.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_CONNECTION_H_
 #define DEVICE_SERIAL_SERIAL_CONNECTION_H_
 
 #include <stdint.h>
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "device/serial/serial.mojom.h"
-#include "mojo/public/cpp/bindings/strong_binding.h"
 
 namespace device {
 
 class DataSinkReceiver;
 class DataSourceSender;
 class ReadOnlyBuffer;
 class SerialIoHandler;
 class WritableBuffer;
 
 class SerialConnection : public serial::Connection {
  public:
   SerialConnection(scoped_refptr<SerialIoHandler> io_handler,
                    mojo::InterfaceRequest<serial::DataSink> sink,
                    mojo::InterfaceRequest<serial::DataSource> source,
-                   mojo::InterfacePtr<serial::DataSourceClient> source_client,
-                   mojo::InterfaceRequest<serial::Connection> request);
+                   mojo::InterfacePtr<serial::DataSourceClient> source_client);
   ~SerialConnection() override;
 
   // serial::Connection overrides.
   void GetInfo(const GetInfoCallback& callback) override;
   void SetOptions(serial::ConnectionOptionsPtr options,
                   const SetOptionsCallback& callback) override;
   void SetControlSignals(serial::HostControlSignalsPtr signals,
                          const SetControlSignalsCallback& callback) override;
   void GetControlSignals(const GetControlSignalsCallback& callback) override;
   void Flush(const FlushCallback& callback) override;
 
  private:
   void OnSendPipeReady(std::unique_ptr<ReadOnlyBuffer> buffer);
   void OnSendCancelled(int32_t error);
   void OnReceivePipeReady(std::unique_ptr<WritableBuffer> buffer);
 
   scoped_refptr<SerialIoHandler> io_handler_;
   scoped_refptr<DataSinkReceiver> receiver_;
   scoped_refptr<DataSourceSender> sender_;
 
-  mojo::StrongBinding<serial::Connection> binding_;
-
   DISALLOW_COPY_AND_ASSIGN(SerialConnection);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_SERIAL_SERIAL_CONNECTION_H_