Regression fix: continue to defer to CSSOM for window.open()'s features

Regressed in 29afad4.

Author: annevk

source

@@ -78201,6 +78201,10 @@ callback <dfn>FrameRequestCallback</dfn> = void (<span>DOMHighResTimeStamp</span
 
    <li><p>If <var>target browsing context</var> is null, then return null.</p></li>
 
+   <li><p>If <var>new</var> is true, then <span>set up browsing context features</span> for
+   <var>target browsing context</var> given <var>tokenizedFeatures</var>. <ref
+   spec="CSSOMVIEW"></p></li>
+
    <li><p>Let <var>resource</var> be the <span>URL</span> "<code>about:blank</code>".</p></li>
 
    <li>