Sync worker interfaces with the HTML spec

Source/core/workers/Worker.idl

 /*
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  * Copyright (C) 2011 Google Inc. All Rights Reserved.
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-// http://www.whatwg.org/specs/web-apps/current-work/#dedicated-workers-and-the-worker-interface
+// https://html.spec.whatwg.org/#dedicated-workers-and-the-worker-interface
 
 [
     ActiveDOMObject,
     Constructor(DOMString scriptUrl),
     ConstructorCallWith=ExecutionContext,
+    // TODO(philipj): Exposed=(Window,Worker),
     RaisesException=Constructor,
 ] interface Worker : EventTarget {
+    void terminate();
 
+    // TODO(philipj): The SerializedScriptValue type should be any.
+    [PostMessage, RaisesException] void postMessage(SerializedScriptValue message, optional sequence<Transferable> transfer);
     attribute EventHandler onmessage;
-
-    [PostMessage, RaisesException] void postMessage(SerializedScriptValue message, optional sequence<Transferable> transfer);
-    void terminate();
 };
 
 Worker implements AbstractWorker;