Regression fix: include WindowEventHandlers in Window

This line was accidentally deleted in c501dd8.

Author: jeremyroman

source

@@ -78251,6 +78251,7 @@ interface <dfn data-export="" data-dfn-type="interface">Window</dfn> : <span>Eve
   void <span data-x="dom-window-postMessage-options">postMessage</span>(any message, optional <span>WindowPostMessageOptions</span> options);
 };
 <span>Window</span> includes <span>GlobalEventHandlers</span>;
+<span>Window</span> includes <span>WindowEventHandlers</span>;
 
 dictionary <dfn>WindowPostMessageOptions</dfn> : <span>PostMessageOptions</span> {
   USVString targetOrigin = "/";