Use "current settings object" in the frameElement origin check

Since this is a same origin-domain check, we can use any settings
object, as they are all same origin-domain. Part of whatwg#1431.

source

@@ -77100,7 +77100,7 @@ dictionary <dfn>DragEventInit</dfn> : <span>MouseEventInit</span> {
    container</span>.</p></li>
 
    <li><p>If <var>container</var>'s <span>node document</span>'s <span>origin</span> is not
-   <span>same origin-domain</span> with the <span>entry settings object</span>'s
+   <span>same origin-domain</span> with the <span>current settings object</span>'s
    <span>origin</span>, then return null and abort these steps.</p></li>
 
    <li><p>Return <var>container</var>.</p></li>