Remove event path monkey patch

The DOM Standard (finally) defines that Window is at the top of the event path when a Document has
an associated browsing context and the event’s type is not “load”.

See whatwg/dom@2d7b637 for details.

source

@@ -86500,24 +86500,6 @@ interface <dfn>WindowEventHandlers</dfn> {
   </div>
 
 
-  <div w-nodev>
-
-  <h5>Events and the <code>Window</code> object</h5>
-
-  <p>When an event is dispatched at a DOM node in a <code>Document</code> that has a <span
-  data-x="concept-document-bc">browsing context</span>, if the event is not a <code
-  data-x="event-load">load</code> event, the user agent must act as if, for the purposes of <span
-  data-x="concept-event-dispatch">event dispatching</span>, the <code>Window</code> object is the
-  parent of the <code>Document</code> object. <ref spec=DOM></p>
-
-  <!-- If Anne does this: http://krijnhoetmer.nl/irc-logs/whatwg/20121205#l-4 (see bug 18780)
-  <p>If a <code>Document</code> object is associated with a <code>Window</code> object, its
-  <span>event parent</span> is that <code>Window</code> object.</p>
-  -->
-
-  </div>
-
-
   <h3 id="atob">Base64 utility methods</h3>
 
   <p>The <code data-x="dom-windowbase64-atob">atob()</code> and <code