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

mojo/edk/system/incoming_endpoint.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_INCOMING_ENDPOINT_H_
 #define MOJO_EDK_SYSTEM_INCOMING_ENDPOINT_H_
 
 #include <stddef.h>
 
 #include "mojo/edk/system/channel_endpoint_client.h"
 #include "mojo/edk/system/message_in_transit_queue.h"
 #include "mojo/edk/system/mutex.h"
 #include "mojo/edk/system/ref_ptr.h"
 #include "mojo/public/cpp/system/macros.h"
 
 struct MojoCreateDataPipeOptions;
 
 namespace mojo {
 namespace system {
 
 class ChannelEndpoint;
 class DataPipe;
 class MessagePipe;
 
 // This is a simple |ChannelEndpointClient| that only receives messages. It's
 // used for endpoints that are "received" by |Channel|, but not yet turned into
 // |MessagePipe|s or |DataPipe|s.
 class IncomingEndpoint final : public ChannelEndpointClient {
  public:
-  IncomingEndpoint();
+  // Note: Use |MakeRefCounted<IncomingEndpoint>()|.
 
   // Must be called before any other method.
   RefPtr<ChannelEndpoint> Init() MOJO_NOT_THREAD_SAFE;
 
-  scoped_refptr<MessagePipe> ConvertToMessagePipe();
-  scoped_refptr<DataPipe> ConvertToDataPipeProducer(
+  RefPtr<MessagePipe> ConvertToMessagePipe();
+  RefPtr<DataPipe> ConvertToDataPipeProducer(
       const MojoCreateDataPipeOptions& validated_options,
       size_t consumer_num_bytes);
-  scoped_refptr<DataPipe> ConvertToDataPipeConsumer(
+  RefPtr<DataPipe> ConvertToDataPipeConsumer(
       const MojoCreateDataPipeOptions& validated_options);
 
   // Must be called before destroying this object if |ConvertToMessagePipe()|
   // wasn't called (but |Init()| was).
   void Close();
 
   // |ChannelEndpointClient| methods:
   bool OnReadMessage(unsigned port, MessageInTransit* message) override;
   void OnDetachFromChannel(unsigned port) override;
 
  private:
+  FRIEND_MAKE_REF_COUNTED(IncomingEndpoint);
+
+  IncomingEndpoint();
   ~IncomingEndpoint() override;
 
   Mutex mutex_;
   RefPtr<ChannelEndpoint> endpoint_ MOJO_GUARDED_BY(mutex_);
   MessageInTransitQueue message_queue_ MOJO_GUARDED_BY(mutex_);
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(IncomingEndpoint);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_INCOMING_ENDPOINT_H_