Convert all usages of mojo::ErrorHandler in //device/serial to callbacks.

device/serial/data_sender.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_SENDER_H_
 #define DEVICE_SERIAL_DATA_SENDER_H_
 
 #include <queue>
 
 #include "base/callback.h"
 #include "base/memory/linked_ptr.h"
 #include "base/strings/string_piece.h"
 #include "device/serial/buffer.h"
 #include "device/serial/data_stream.mojom.h"
 #include "third_party/mojo/src/mojo/public/cpp/system/data_pipe.h"
 
 namespace device {
 
 // A DataSender sends data to a DataSink.
-class DataSender : public mojo::ErrorHandler {
+class DataSender {
  public:
   typedef base::Callback<void(uint32_t bytes_sent)> DataSentCallback;
   typedef base::Callback<void(uint32_t bytes_sent, int32_t error)>
       SendErrorCallback;
   typedef base::Callback<void()> CancelCallback;
 
   // Constructs a DataSender to send data to |sink|, using a buffer size of
   // |buffer_size|, with connection errors reported as |fatal_error_value|.
   DataSender(mojo::InterfacePtr<serial::DataSink> sink,
              uint32_t buffer_size,
              int32_t fatal_error_value);
 
-  ~DataSender() override;
+  ~DataSender();
 
   // Starts an asynchronous send of |data|. If the send completes successfully,
   // |callback| will be called. Otherwise, |error_callback| will be called with
   // the error. If there is a cancel in progress or there has been a connection
   // error, this will not start a send and returns false. It is the caller's
   // responsibility to ensure |data| remains valid until one of |callback| and
   // |error_callback| is called.
   bool Send(const base::StringPiece& data,
             const DataSentCallback& callback,
             const SendErrorCallback& error_callback);
 
   // Requests the cancellation of any in-progress sends. Calls to Send() will
   // fail until |callback| is called.
   bool Cancel(int32_t error, const CancelCallback& callback);
 
  private:
   class PendingSend;
 
   // Invoked when a PendingSend completes.
   void SendComplete();
 
   // Invoked when a PendingSend fails with |error|.
   void SendFailed(int32_t error);
 
-  // mojo::ErrorHandler override.
-  void OnConnectionError() override;
+  // mojo error handler
+  void OnConnectionError();
 
   // Dispatches a cancel callback if one is pending.
   void RunCancelCallback();
 
   // Shuts down this DataSender and dispatches fatal errors to all pending
   // operations.
   void ShutDown();
 
   // The control connection to the data sink.
   mojo::InterfacePtr<serial::DataSink> sink_;
@@ skipping 11 matching lines @@
 
   // Whether we have encountered a fatal error and shut down.
   bool shut_down_;
 
   DISALLOW_COPY_AND_ASSIGN(DataSender);
 };
 
 }  // namespace device
 
 #endif  // DEVICE_SERIAL_DATA_SENDER_H_