Expose WorkerGlobalScope interface in worker environment

Source/core/workers/WorkerGlobalScope.idl

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
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 [
-    NoInterfaceObject,
+    GlobalContext=WorkerGlobalScope,
     EventTarget,
     CustomToV8,
     DoNotGenerateWrap
 ] interface WorkerGlobalScope {
 
     // WorkerGlobalScope
     [Replaceable] readonly attribute WorkerGlobalScope self;
     [Replaceable] readonly attribute WorkerLocation location;
     void close();
     attribute EventListener onerror;
@@ skipping 10 matching lines @@
                              EventListener listener, 
                              optional boolean useCapture);
     [RaisesException] boolean dispatchEvent(Event evt);
 
     // Additional constructors
     attribute URLConstructor webkitURL; // FIXME: deprecate this.
 };
 
 WorkerGlobalScope implements WindowTimers;