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

mojo/edk/system/endpoint_relayer.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_ENDPOINT_RELAYER_H_
 #define MOJO_EDK_SYSTEM_ENDPOINT_RELAYER_H_
 
 #include <memory>
 
-#include "base/memory/ref_counted.h"
 #include "mojo/edk/system/channel_endpoint_client.h"
 #include "mojo/edk/system/mutex.h"
 #include "mojo/edk/system/ref_ptr.h"
 #include "mojo/public/cpp/system/macros.h"
 
 namespace mojo {
 namespace system {
 
 class ChannelEndpoint;
 
@@ skipping 34 matching lines @@
                                ChannelEndpoint* peer_endpoint,
                                MessageInTransit* message) = 0;
 
    protected:
     Filter() {}
 
    private:
     MOJO_DISALLOW_COPY_AND_ASSIGN(Filter);
   };
 
-  EndpointRelayer();
+  // Note: Use |MakeRefCounted<EndpointRelayer>()|.
 
   // Gets the other port number (i.e., 0 -> 1, 1 -> 0).
   static unsigned GetPeerPort(unsigned port);
 
   // Initialize this object. This must be called before any other method.
   void Init(RefPtr<ChannelEndpoint>&& endpoint0,
             RefPtr<ChannelEndpoint>&& endpoint1) MOJO_NOT_THREAD_SAFE;
 
   // Sets (or resets) the filter, which can (optionally) handle/filter
   // |Type::ENDPOINT_CLIENT| messages (see |Filter| above).
   void SetFilter(std::unique_ptr<Filter> filter);
 
   // |ChannelEndpointClient| methods:
   bool OnReadMessage(unsigned port, MessageInTransit* message) override;
   void OnDetachFromChannel(unsigned port) override;
 
  private:
+  FRIEND_MAKE_REF_COUNTED(EndpointRelayer);
+
+  EndpointRelayer();
   ~EndpointRelayer() override;
 
   Mutex mutex_;
   RefPtr<ChannelEndpoint> endpoints_[2] MOJO_GUARDED_BY(mutex_);
   std::unique_ptr<Filter> filter_ MOJO_GUARDED_BY(mutex_);
 
   MOJO_DISALLOW_COPY_AND_ASSIGN(EndpointRelayer);
 };
 
 }  // namespace system
 }  // namespace mojo
 
 #endif  // MOJO_EDK_SYSTEM_ENDPOINT_RELAYER_H_