Revert of Deletes mojo::Callback

device/serial/data_sink_receiver.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_DATA_SINK_RECEIVER_H_
 #define DEVICE_SERIAL_DATA_SINK_RECEIVER_H_
 
 #include <stdint.h>
 
 #include <memory>
@@ skipping 34 matching lines @@
   // |cancel_callback| and |error_callback| will never be called.
   void ShutDown();
 
  private:
   class Buffer;
   class DataFrame;
   friend class base::RefCounted<DataSinkReceiver>;
 
   ~DataSinkReceiver() override;
 
-  // serial::DataSink overrides.
+  // mojo::InterfaceImpl<serial::DataSink> overrides.
   void Cancel(int32_t error) override;
   void OnData(mojo::Array<uint8_t> data,
-              const OnDataCallback& callback) override;
+              const mojo::Callback<void(uint32_t, int32_t)>& callback) override;
   void ClearError() override;
 
   void OnConnectionError();
 
   // Dispatches data to |ready_callback_|.
   void RunReadyCallback();
 
   // Reports a successful read of |bytes_read|.
   void Done(uint32_t bytes_read);
 
@@ skipping 36 matching lines @@
   bool shut_down_;
 
   base::WeakPtrFactory<DataSinkReceiver> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(DataSinkReceiver);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_SERIAL_DATA_SINK_RECEIVER_H_