Correct CrossOriginProperties and callers

Having CrossOriginProperties include the document-tree child browsing context name properties was incorrect for all its callers.

The IDL object they are defined upon is not accessible across origins.

CrossOriginGetOwnPropertyHelper would end up checking the [[Value]] slot of undefined (i.e., a specification error), as they are not own properties of the global object.

And CrossOriginOwnPropertyKeys was excluding them deliberately (though then for "then" incorrectly assuming they were included anyway).

WPT html/browsers/origin/cross-origin-objects/cross-origin-objects.html seems to be testing all this as expected.

Closes #5393.

source

@@ -77373,8 +77373,7 @@ console.assert(iframeWindow.frameElement === null);
    then return.</p>
 
    <li>
-    <p>Repeat for each <var>e</var> that is an element of !
-    <span>CrossOriginProperties</span>(<var>platformObject</var>):</p>
+    <p>For each <var>e</var> of ! <span>CrossOriginProperties</span>(<var>platformObject</var>):</p>
 
     <ol>
      <li>
@@ -77443,7 +77442,7 @@ console.assert(iframeWindow.frameElement === null);
    { [[Property]]: "<code data-x="">href</code>", [[NeedsGet]]: false, [[NeedsSet]]: true },
    { [[Property]]: "<code data-x="">replace</code>" } ».</p></li>
 
-   <li><p>Let <var>crossOriginWindowProperties</var> be «
+   <li><p>Return «
    { [[Property]]: "<code data-x="">window</code>", [[NeedsGet]]: true, [[NeedsSet]]: false },
    { [[Property]]: "<code data-x="">self</code>", [[NeedsGet]]: true, [[NeedsSet]]: false },
    { [[Property]]: "<code data-x="">location</code>", [[NeedsGet]]: true, [[NeedsSet]]: true },
@@ -77457,18 +77456,6 @@ console.assert(iframeWindow.frameElement === null);
    { [[Property]]: "<code data-x="">opener</code>", [[NeedsGet]]: true, [[NeedsSet]]: false },
    { [[Property]]: "<code data-x="">parent</code>", [[NeedsGet]]: true, [[NeedsSet]]: false },
    { [[Property]]: "<code data-x="">postMessage</code>" } ».</p></li>
-
-   <li>
-    <p>Repeat for each <var>e</var> that is an element of <var>O</var>'s <span>document-tree child
-    browsing context name property set</span>:</p>
-
-    <ol>
-     <li><p>Add { [[Property]]: <var>e</var>, [[HideFromKeys]]: true } as the last element of
-     <var>crossOriginWindowProperties</var>.</p></li>
-    </ol>
-   </li>
-
-   <li><p>Return <var>crossOriginWindowProperties</var>.</p></li>
   </ol>
 
   <p class="note">Indexed properties do not need to be safelisted as they are handled directly by
@@ -77508,8 +77495,7 @@ console.assert(iframeWindow.frameElement === null);
    object</span>, <var>O</var>'s <span>relevant settings object</span>, and <var>P</var>.</p></li>
 
    <li>
-    <p>Repeat for each <var>e</var> that is an element of !
-    <span>CrossOriginProperties</span>(<var>O</var>):</p>
+    <p>For each <var>e</var> of ! <span>CrossOriginProperties</span>(<var>O</var>):</p>
 
     <ol>
      <li>
@@ -77641,22 +77627,12 @@ console.assert(iframeWindow.frameElement === null);
   <ol>
    <li><p>Let <var>keys</var> be a new empty <span data-x="js-List">List</span>.</p></li>
 
-   <li>
-    <p>Repeat for each <var>e</var> that is an element of !
-    <span>CrossOriginProperties</span>(<var>O</var>):</p>
-
-    <ol>
-     <li><p>If <var>e</var>.[[HideFromKeys]] is not true, <span data-x="list append">append</span>
-     <var>e</var>.[[Property]] to <var>keys</var>.</p></li>
-    </ol>
-   </li>
-
-   <li><p>If <var>keys</var> <span data-x="list contains">does not contain</span> "<code
-   data-x="">then</code>", then <span data-x="list append">append</span> "<code
-   data-x="">then</code>" to <var>keys</var>.</p></li>
+   <li><p>For each <var>e</var> of ! <span>CrossOriginProperties</span>(<var>O</var>), <span
+   data-x="list append">append</span> <var>e</var>.[[Property]] to <var>keys</var>.</p></li>
 
-   <li><p>Return the concatenation of <var>keys</var> and « <span>@@toStringTag</span>,
-   <span>@@hasInstance</span>, <span>@@isConcatSpreadable</span> ».</p></li>
+   <li><p>Return the concatenation of <var>keys</var> and « "<code data-x="">then</code>",
+   <span>@@toStringTag</span>, <span>@@hasInstance</span>, <span>@@isConcatSpreadable</span>
+   ».</p></li>
   </ol>
 
   </div>