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

mojo/edk/system/channel_manager.h

 // 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.
 
 #ifndef MOJO_EDK_SYSTEM_CHANNEL_MANAGER_H_
 #define MOJO_EDK_SYSTEM_CHANNEL_MANAGER_H_
 
 #include <stdint.h>
 
 #include <unordered_map>
@@ skipping 52 matching lines @@
   // TODO(vtl): Consider if this is really necessary, since it only has one use
   // (in tests).
   void Shutdown(const base::Closure& callback,
                 scoped_refptr<base::TaskRunner> callback_thread_task_runner);
 
   // Creates a |Channel| and adds it to the set of channels managed by this
   // |ChannelManager|. This must be called from the I/O thread (given to the
   // constructor). |channel_id| should be a valid |ChannelId| (i.e., nonzero)
   // not "assigned" to any other |Channel| being managed by this
   // |ChannelManager|.
-  scoped_refptr<MessagePipeDispatcher> CreateChannelOnIOThread(
+  RefPtr<MessagePipeDispatcher> CreateChannelOnIOThread(
       ChannelId channel_id,
       embedder::ScopedPlatformHandle platform_handle);
 
   // Like |CreateChannelOnIOThread()|, but doesn't create a bootstrap message
   // pipe. Returns the newly-created |Channel|.
   // TODO(vtl): Maybe get rid of the others (and bootstrap message pipes in
   // general).
   RefPtr<Channel> CreateChannelWithoutBootstrapOnIOThread(
       ChannelId channel_id,
       embedder::ScopedPlatformHandle platform_handle);
 
   // Like |CreateChannelOnIOThread()|, but may be called from any thread. On
   // completion, will call |callback| (using |callback_thread_task_runner| if it
   // is non-null, else on the I/O thread). Note: This will always post a task to
   // the I/O thread, even if called from that thread.
-  scoped_refptr<MessagePipeDispatcher> CreateChannel(
+  RefPtr<MessagePipeDispatcher> CreateChannel(
       ChannelId channel_id,
       embedder::ScopedPlatformHandle platform_handle,
       const base::Closure& callback,
       scoped_refptr<base::TaskRunner> callback_thread_task_runner);
 
   // Gets the |Channel| with the given ID (which must exist).
   RefPtr<Channel> GetChannel(ChannelId channel_id) const;
 
   // Informs the channel manager (and thus channel) that it will be shutdown
   // soon (by calling |ShutdownChannel()|). Calling this is optional (and may in
@@ skipping 57 matching lines @@
   using ChannelIdToChannelMap = std::unordered_map<ChannelId, RefPtr<Channel>>;
   ChannelIdToChannelMap channels_ MOJO_GUARDED_BY(mutex_);
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(ChannelManager);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_CHANNEL_MANAGER_H_