Revert my last change. Odd test failures that I will investigate tomorrow.

runtime/vm/dart_api_impl.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 "include/dart_api.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart.h"
@@ skipping 628 matching lines @@
 }
 
 
 DART_EXPORT Dart_Handle Dart_HandleMessage() {
   Isolate* isolate = Isolate::Current();
   // Process all OOB messages and at most one normal message.
   Message* message = NULL;
   Message::Priority priority = Message::kNormalPriority;
   do {
     DARTSCOPE(isolate);
-    message = isolate->message_handler()->DequeueNoWait();
+    message = isolate->message_handler()->queue()->DequeueNoWait();
     if (message == NULL) {
       break;
     }
     priority = message->priority();
     if (priority == Message::kOOBPriority) {
       // TODO(turnidge): Out of band messages will not go through the
       // regular message handler.  Instead they will be dispatched to
       // special vm code.  Implement.
       UNIMPLEMENTED();
     }
@@ skipping 2052 matching lines @@
       *buffer = NULL;
     }
     delete debug_region;
   } else {
     *buffer = NULL;
     *buffer_size = 0;
   }
 }
 
 }  // namespace dart