Move AcceptWithResponder() out of the MessageReceiver interface.

mojo/public/cpp/bindings/tests/router_unittest.cc

 // 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.
 
 #include <stdlib.h>
 #include <string.h>
 
 #include "mojo/public/cpp/bindings/lib/message_builder.h"
 #include "mojo/public/cpp/bindings/lib/message_queue.h"
 #include "mojo/public/cpp/bindings/lib/router.h"
@@ skipping 24 matching lines @@
 class MessageAccumulator : public MessageReceiver {
  public:
   explicit MessageAccumulator(internal::MessageQueue* queue) : queue_(queue) {
   }
 
   virtual bool Accept(Message* message) MOJO_OVERRIDE {
     queue_->Push(message);
     return true;
   }
 
-  virtual bool AcceptWithResponder(Message* message, MessageReceiver* responder)
-      MOJO_OVERRIDE {
-    return false;
-  }
-
  private:
   internal::MessageQueue* queue_;
 };
 
-class ResponseGenerator : public MessageReceiver {
+class ResponseGenerator : public MessageReceiverWithResponder {
  public:
   ResponseGenerator() {
   }
 
   virtual bool Accept(Message* message) MOJO_OVERRIDE {
     return false;
   }
 
   virtual bool AcceptWithResponder(Message* message, MessageReceiver* responder)
       MOJO_OVERRIDE {
@@ skipping 136 matching lines @@
     EXPECT_TRUE(generator.has_responder());
 
   }
 
   generator.Complete();  // This should end up doing nothing.
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace mojo