Remove implicit conversions from scoped_refptr to T* in mojo/

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 144 matching lines @@
 
 MojoResult MessagePipe::EnqueueMessage(unsigned port,
                                        scoped_ptr<MessageInTransit> message) {
   return EnqueueMessageInternal(port, message.Pass(), NULL);
 }
 
 bool MessagePipe::Attach(unsigned port,
                          scoped_refptr<Channel> channel,
                          MessageInTransit::EndpointId local_id) {
   DCHECK(port == 0 || port == 1);
-  DCHECK(channel);
+  DCHECK(channel.get());
   DCHECK_NE(local_id, MessageInTransit::kInvalidEndpointId);
 
   base::AutoLock locker(lock_);
   if (!endpoints_[port])
     return false;
 
   DCHECK_EQ(endpoints_[port]->GetType(), MessagePipeEndpoint::kTypeProxy);
   endpoints_[port]->Attach(channel, local_id);
   return true;
 }
@@ skipping 111 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