Remove the reply port form the native isolate handler

runtime/include/dart_native_api.h

 /*
  * Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
  * for details. All rights reserved. Use of this source code is governed by a
  * BSD-style license that can be found in the LICENSE file.
  */
 
 #ifndef INCLUDE_DART_NATIVE_API_H_
 #define INCLUDE_DART_NATIVE_API_H_
 
 #include "include/dart_api.h"
@@ skipping 21 matching lines @@
   Dart_CObject_kNull = 0,
   Dart_CObject_kBool,
   Dart_CObject_kInt32,
   Dart_CObject_kInt64,
   Dart_CObject_kBigint,
   Dart_CObject_kDouble,
   Dart_CObject_kString,
   Dart_CObject_kArray,
   Dart_CObject_kTypedData,
   Dart_CObject_kExternalTypedData,
+  Dart_CObject_kSendPort,
   Dart_CObject_kUnsupported,
   Dart_CObject_kNumberOfTypes
 } Dart_CObject_Type;
 
 typedef struct _Dart_CObject {
   Dart_CObject_Type type;
   union {
     bool as_bool;
     int32_t as_int32;
     int64_t as_int64;
     double as_double;
     char* as_string;
     char* as_bigint;
+    Dart_Port as_send_port;
     struct {
       intptr_t length;
       struct _Dart_CObject** values;
     } as_array;
     struct {
       Dart_TypedData_Type type;
       intptr_t length;
       uint8_t* values;
     } as_typed_data;
     struct {
@@ skipping 29 matching lines @@
  * This handler is associated with a native port by calling
  * Dart_NewNativePort.
  *
  * The message received is decoded into the message structure. The
  * lifetime of the message data is controlled by the caller. All the
  * data references from the message are allocated by the caller and
  * will be reclaimed when returning to it.
  */
 
 typedef void (*Dart_NativeMessageHandler)(Dart_Port dest_port_id,
-Dart_Port reply_port_id,
-Dart_CObject* message);
+                                          Dart_CObject* message);
 
 /**
  * Creates a new native port.  When messages are received on this
  * native port, then they will be dispatched to the provided native
  * message handler.
  *
  * \param name The name of this port in debugging messages.
  * \param handler The C handler to run when messages arrive on the port.
  * \param handle_concurrently Is it okay to process requests on this
  *                            native port concurrently?
@@ skipping 68 matching lines @@
  */
 DART_EXPORT Dart_Handle Dart_CompileAll();
 
 /**
  * Check that all function fingerprints are OK.
  *
  */
 DART_EXPORT Dart_Handle Dart_CheckFunctionFingerprints();
 
 #endif  /* INCLUDE_DART_NATIVE_API_H_ */  /* NOLINT */