Mojo C++ bindings: Simplify associated interface API.

mojo/public/cpp/bindings/lib/pipe_control_message_handler.cc

Index: mojo/public/cpp/bindings/lib/pipe_control_message_handler.cc
diff --git a/mojo/public/cpp/bindings/lib/pipe_control_message_handler.cc b/mojo/public/cpp/bindings/lib/pipe_control_message_handler.cc
index bf3bb97d5ac5adcacf94d78712a0244b387550a8..d451c05a5fb888a0e9ca16f9df72fcd0ef86c441 100644
--- a/mojo/public/cpp/bindings/lib/pipe_control_message_handler.cc
+++ b/mojo/public/cpp/bindings/lib/pipe_control_message_handler.cc
@@ -81,11 +81,6 @@ bool PipeControlMessageHandler::RunOrClosePipe(Message* message) {
     }
     return delegate_->OnPeerAssociatedEndpointClosed(event->id, reason);
   }
-  if (params_ptr->input->is_associated_endpoint_closed_before_sent_event()) {
-    return delegate_->OnAssociatedEndpointClosedBeforeSent(
-        params_ptr->input->get_associated_endpoint_closed_before_sent_event()
-            ->id);
-  }
 
   DVLOG(1) << "Unsupported command in a RunOrClosePipe message pipe control "
            << "message. Closing the pipe.";