Remove implicit conversions from scoped_refptr to T* in mojo/

mojo/system/message_pipe_dispatcher.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_dispatcher.h"
 
 #include "base/logging.h"
 #include "mojo/system/channel.h"
 #include "mojo/system/constants.h"
 #include "mojo/system/local_message_pipe_endpoint.h"
@@ skipping 52 matching lines @@
 
   // Checks for fields beyond |flags|:
 
   // (Nothing here yet.)
 
   return MOJO_RESULT_OK;
 }
 
 void MessagePipeDispatcher::Init(scoped_refptr<MessagePipe> message_pipe,
                                  unsigned port) {
-  DCHECK(message_pipe);
+  DCHECK(message_pipe.get());
   DCHECK(port == 0 || port == 1);
 
   message_pipe_ = message_pipe;
   port_ = port;
 }
 
 Dispatcher::Type MessagePipeDispatcher::GetType() const {
   return kTypeMessagePipe;
 }
 
@@ skipping 49 matching lines @@
     return scoped_refptr<MessagePipeDispatcher>();
   }
 
   // TODO(vtl): FIXME -- Need some error handling here.
   channel->RunRemoteMessagePipeEndpoint(local_id, remote_id);
   return remote_message_pipe.first;
 }
 
 MessagePipeDispatcher::~MessagePipeDispatcher() {
   // |Close()|/|CloseImplNoLock()| should have taken care of the pipe.
-  DCHECK(!message_pipe_);
+  DCHECK(!message_pipe_.get());
 }
 
 MessagePipe* MessagePipeDispatcher::GetMessagePipeNoLock() const {
   lock().AssertAcquired();
   return message_pipe_.get();
 }
 
 unsigned MessagePipeDispatcher::GetPortNoLock() const {
   lock().AssertAcquired();
   return port_;
@@ skipping 122 matching lines @@
 // MessagePipeDispatcherTransport ----------------------------------------------
 
 MessagePipeDispatcherTransport::MessagePipeDispatcherTransport(
     DispatcherTransport transport)
     : DispatcherTransport(transport) {
   DCHECK_EQ(message_pipe_dispatcher()->GetType(), Dispatcher::kTypeMessagePipe);
 }
 
 }  // namespace system
 }  // namespace mojo