IPC: Get rid of FileDescriptor usage from FileDescriptorSet and Message

ipc/mojo/ipc_channel_mojo_readers.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 "ipc/mojo/ipc_channel_mojo_readers.h"
 
 #include "ipc/mojo/ipc_channel_mojo.h"
 #include "mojo/embedder/embedder.h"
 
 #if defined(OS_POSIX) && !defined(OS_NACL)
@@ skipping 120 matching lines @@
   owner_->OnPipeError(this);
 }
 
 bool MessageReader::Send(scoped_ptr<Message> message) {
   DCHECK(IsValid());
 
   message->TraceMessageBegin();
   std::vector<MojoHandle> handles;
 #if defined(OS_POSIX) && !defined(OS_NACL)
   MojoResult read_result =
-      ChannelMojo::ReadFromFileDescriptorSet(*message, &handles);
+      ChannelMojo::ReadFromFileDescriptorSet(message.get(), &handles);
   if (read_result != MOJO_RESULT_OK) {
     std::for_each(handles.begin(), handles.end(), &MojoClose);
     CloseWithError(read_result);
     return false;
   }
 #endif
   MojoResult write_result =
       MojoWriteMessage(handle(),
                        message->data(),
                        static_cast<uint32>(message->size()),
@@ skipping 160 matching lines @@
 
   MojoResult result = RespondHelloRequest(handle_buffer[0]);
   if (result != MOJO_RESULT_OK) {
     DLOG(ERROR) << "Failed to respond Hello request. Closing: " << result;
     CloseWithError(result);
   }
 }
 
 }  // namespace internal
 }  // namespace IPC