Create DOM exceptions in the correct context.

Source/bindings/v8/custom/V8WorkerCustom.cpp

 /*
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 42 matching lines @@
         if (!extractTransferables(info[transferablesArgIndex], ports, arrayBuffers, notASequence, info.GetIsolate())) {
             if (notASequence)
                 throwTypeError(ExceptionMessages::failedToExecute("postMessage", "Worker", ExceptionMessages::notAnArrayTypeArgumentOrValue(transferablesArgIndex + 1)), info.GetIsolate());
             return;
         }
     }
     bool didThrow = false;
     RefPtr<SerializedScriptValue> message = SerializedScriptValue::create(info[0], &ports, &arrayBuffers, didThrow, info.GetIsolate());
     if (didThrow)
         return;
-    ExceptionState es(info.GetIsolate());
+    ExceptionState es(info.Holder(), info.GetIsolate());
     worker->postMessage(message.release(), &ports, es);
     es.throwIfNeeded();
 }
 
 } // namespace WebCore