Revert of Deletes mojo::Callback

device/serial/serial_service_impl.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_SERVICE_IMPL_H_
 #define DEVICE_SERIAL_SERIAL_SERVICE_IMPL_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 19 matching lines @@
   static void Create(scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
                      scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
                      mojo::InterfaceRequest<serial::SerialService> request);
   static void CreateOnMessageLoop(
       scoped_refptr<base::SingleThreadTaskRunner> task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> io_task_runner,
       scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner,
       mojo::InterfaceRequest<serial::SerialService> request);
 
   // SerialService overrides.
-  void GetDevices(const GetDevicesCallback& callback) override;
+  void GetDevices(
+      const mojo::Callback<void(mojo::Array<serial::DeviceInfoPtr>)>& callback)
+      override;
   void Connect(
       const mojo::String& path,
       serial::ConnectionOptionsPtr options,
       mojo::InterfaceRequest<serial::Connection> connection_request,
       mojo::InterfaceRequest<serial::DataSink> sink,
       mojo::InterfaceRequest<serial::DataSource> source,
       mojo::InterfacePtr<serial::DataSourceClient> source_client) override;
 
  private:
   SerialDeviceEnumerator* GetDeviceEnumerator();
   bool IsValidPath(const mojo::String& path);
 
   std::unique_ptr<SerialDeviceEnumerator> device_enumerator_;
   scoped_refptr<SerialConnectionFactory> connection_factory_;
   mojo::StrongBinding<serial::SerialService> binding_;
 
   DISALLOW_COPY_AND_ASSIGN(SerialServiceImpl);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_SERIAL_SERIAL_SERVICE_IMPL_H_