Revert of Deletes mojo::Callback

device/serial/serial_service_impl.cc

 // 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.
 
 #include "device/serial/serial_service_impl.h"
 
 #include <stddef.h>
 
 #include <memory>
 #include <utility>
@@ skipping 38 matching lines @@
 void SerialServiceImpl::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) {
   task_runner->PostTask(FROM_HERE,
                         base::Bind(&SerialServiceImpl::Create, io_task_runner,
                                    ui_task_runner, base::Passed(&request)));
 }
 
-void SerialServiceImpl::GetDevices(const GetDevicesCallback& callback) {
+void SerialServiceImpl::GetDevices(
+    const mojo::Callback<void(mojo::Array<serial::DeviceInfoPtr>)>& callback) {
   callback.Run(GetDeviceEnumerator()->GetDevices());
 }
 
 void SerialServiceImpl::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) {
@@ skipping 14 matching lines @@
   mojo::Array<serial::DeviceInfoPtr> devices(
       GetDeviceEnumerator()->GetDevices());
   for (size_t i = 0; i < devices.size(); i++) {
     if (path == devices[i]->path)
       return true;
   }
   return false;
 }
 
 }  // namespace device