Start using Dart_SetField and Dart_GetField in the vm.

runtime/bin/eventhandler.cc

 // Copyright (c) 2011, 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 "bin/dartutils.h"
 #include "bin/eventhandler.h"
 
 #include "include/dart_api.h"
 
 
@@ skipping 44 matching lines @@
  * args[1] a ReceivePort args[2] with a notification event args[3]. args[0]
  * holds the reference to the dart EventHandler object.
  */
 void FUNCTION_NAME(EventHandler_SendData)(Dart_NativeArguments args) {
   Dart_EnterScope();
   Dart_Handle handle = Dart_GetNativeArgument(args, 0);
   EventHandler* event_handler = GetEventHandler(handle);
   intptr_t id = DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 1));
   handle = Dart_GetNativeArgument(args, 2);
   Dart_Port dart_port =
-      DartUtils::GetIntegerInstanceField(handle, DartUtils::kIdFieldName);
+      DartUtils::GetIntegerField(handle, DartUtils::kIdFieldName);
   intptr_t data = DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 3));
   event_handler->SendData(id, dart_port, data);
   Dart_ExitScope();
 }