Convert mojo::system::Dispatcher to use our new refcounting stuff (instead of base's).

mojo/edk/system/ipc_support.cc

 // Copyright 2015 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/edk/system/ipc_support.h"
 
 #include <type_traits>
 
 #include "base/logging.h"
 #include "mojo/edk/embedder/master_process_delegate.h"
@@ skipping 70 matching lines @@
   io_thread_task_runner_ = nullptr;
   process_delegate_ = nullptr;
   delegate_thread_task_runner_ = nullptr;
   process_type_ = embedder::ProcessType::UNINITIALIZED;
 }
 
 ConnectionIdentifier IPCSupport::GenerateConnectionIdentifier() {
   return connection_manager()->GenerateConnectionIdentifier();
 }
 
-scoped_refptr<system::MessagePipeDispatcher> IPCSupport::ConnectToSlave(
+RefPtr<MessagePipeDispatcher> IPCSupport::ConnectToSlave(
     const ConnectionIdentifier& connection_id,
     embedder::SlaveInfo slave_info,
     embedder::ScopedPlatformHandle platform_handle,
     const base::Closure& callback,
     scoped_refptr<base::TaskRunner> callback_thread_task_runner,
     ChannelId* channel_id) {
   DCHECK(channel_id);
 
   // We rely on |ChannelId| and |ProcessIdentifier| being identical types.
   static_assert(std::is_same<ChannelId, ProcessIdentifier>::value,
                 "ChannelId and ProcessIdentifier types don't match");
 
   embedder::ScopedPlatformHandle platform_connection_handle =
       ConnectToSlaveInternal(connection_id, slave_info, platform_handle.Pass(),
                              channel_id);
   return channel_manager()->CreateChannel(
       *channel_id, platform_connection_handle.Pass(), callback,
       callback_thread_task_runner);
 }
 
-scoped_refptr<system::MessagePipeDispatcher> IPCSupport::ConnectToMaster(
+RefPtr<MessagePipeDispatcher> IPCSupport::ConnectToMaster(
     const ConnectionIdentifier& connection_id,
     const base::Closure& callback,
     scoped_refptr<base::TaskRunner> callback_thread_task_runner,
     ChannelId* channel_id) {
   DCHECK(channel_id);
 
   static_assert(std::is_same<ChannelId, ProcessIdentifier>::value,
                 "ChannelId and ProcessIdentifier types don't match");
   embedder::ScopedPlatformHandle platform_connection_handle =
       ConnectToMasterInternal(connection_id);
@@ skipping 37 matching lines @@
   CHECK_EQ(connection_manager()->Connect(connection_id, &peer_id, &is_first,
                                          &platform_connection_handle),
            ConnectionManager::Result::SUCCESS_CONNECT_NEW_CONNECTION);
   DCHECK_EQ(peer_id, system::kMasterProcessIdentifier);
   DCHECK(platform_connection_handle.is_valid());
   return platform_connection_handle;
 }
 
 }  // namespace system
 }  // namespace mojo