Convert WriteMessage...() to use the new user pointer handling (see r285350).

mojo/system/message_pipe.cc

 // Copyright 2013 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 "mojo/system/message_pipe.h"
 
 #include "base/logging.h"
 #include "mojo/system/channel.h"
 #include "mojo/system/local_message_pipe_endpoint.h"
 #include "mojo/system/message_in_transit.h"
@@ skipping 49 matching lines @@
   if (endpoints_[destination_port]) {
     if (!endpoints_[destination_port]->OnPeerClose())
       endpoints_[destination_port].reset();
   }
   endpoints_[port].reset();
 }
 
 // TODO(vtl): Handle flags.
 MojoResult MessagePipe::WriteMessage(
     unsigned port,
-    const void* bytes,
+    UserPointer<const void> bytes,
     uint32_t num_bytes,
     std::vector<DispatcherTransport>* transports,
     MojoWriteMessageFlags flags) {
   DCHECK(port == 0 || port == 1);
   return EnqueueMessageInternal(
       GetPeerPort(port),
       make_scoped_ptr(new MessageInTransit(
           MessageInTransit::kTypeMessagePipeEndpoint,
-          MessageInTransit::kSubtypeMessagePipeEndpointData,
-          num_bytes,
-          bytes)),
+          MessageInTransit::kSubtypeMessagePipeEndpointData, num_bytes, bytes)),
       transports);
 }
 
 MojoResult MessagePipe::ReadMessage(unsigned port,
                                     UserPointer<void> bytes,
                                     UserPointer<uint32_t> num_bytes,
                                     DispatcherVector* dispatchers,
                                     uint32_t* num_dispatchers,
                                     MojoReadMessageFlags flags) {
   DCHECK(port == 0 || port == 1);
@@ skipping 184 matching lines @@
 MojoResult MessagePipe::HandleControlMessage(
     unsigned /*port*/,
     scoped_ptr<MessageInTransit> message) {
   LOG(WARNING) << "Unrecognized MessagePipe control message subtype "
                << message->subtype();
   return MOJO_RESULT_UNKNOWN;
 }
 
 }  // namespace system
 }  // namespace mojo