VM: [Kernel] Revert changes to the native ports that introduced peers.

runtime/vm/native_message_handler.cc

 // Copyright (c) 2012, 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.
 
 #include "vm/native_message_handler.h"
 
 #include "vm/dart_api_message.h"
 #include "vm/isolate.h"
 #include "vm/message.h"
 #include "vm/snapshot.h"
 
 namespace dart {
 
 NativeMessageHandler::NativeMessageHandler(const char* name,
-                                           Dart_NativeMessageHandler func,
-                                           void* peer)
-    : name_(strdup(name)), func_(func), peer_(peer) {}
+                                           Dart_NativeMessageHandler func)
+    : name_(strdup(name)), func_(func) {}
 
 
 NativeMessageHandler::~NativeMessageHandler() {
   free(name_);
 }
 
 
 #if defined(DEBUG)
 void NativeMessageHandler::CheckAccess() {
   ASSERT(Isolate::Current() == NULL);
 }
 #endif
 
 
 MessageHandler::MessageStatus NativeMessageHandler::HandleMessage(
     Message* message) {
   if (message->IsOOB()) {
     // We currently do not use OOB messages for native ports.
     UNREACHABLE();
   }
   // We create a native scope for handling the message.
   // All allocation of objects for decoding the message is done in the
   // zone associated with this scope.
   ApiNativeScope scope;
   Dart_CObject* object;
   ApiMessageReader reader(message);
   object = reader.ReadMessage();
-  (*func())(message->dest_port(), object, peer());
+  (*func())(message->dest_port(), object);
   delete message;
   return kOK;
 }
 
 }  // namespace dart