chromeos: Make dbus::MessageReader memory ownership explicit

device/media_transfer_protocol/media_transfer_protocol_daemon_client.cc

 // Copyright (c) 2012 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/media_transfer_protocol/media_transfer_protocol_daemon_client.h"
 
 #include "base/bind.h"
 #include "base/memory/weak_ptr.h"
 #include "dbus/bus.h"
 #include "dbus/message.h"
@@ skipping 331 matching lines @@
   // Handles the result of ReadFileChunkByPath/Id and calls |callback| or
   // |error_callback|.
   void OnReadFile(const ReadFileCallback& callback,
                   const ErrorCallback& error_callback,
                   dbus::Response* response) {
     if (!response) {
       error_callback.Run();
       return;
     }
 
-    uint8* data_bytes = NULL;
+    const uint8* data_bytes = NULL;
     size_t data_length = 0;
     dbus::MessageReader reader(response);
     if (!reader.PopArrayOfBytes(&data_bytes, &data_length)) {
       error_callback.Run();
       return;
     }
     std::string data(reinterpret_cast<const char*>(data_bytes), data_length);
     callback.Run(data);
   }
 
@@ skipping 60 matching lines @@
 
 MediaTransferProtocolDaemonClient::~MediaTransferProtocolDaemonClient() {}
 
 // static
 MediaTransferProtocolDaemonClient* MediaTransferProtocolDaemonClient::Create(
     dbus::Bus* bus) {
   return new MediaTransferProtocolDaemonClientImpl(bus);
 }
 
 }  // namespace device