Make document.domain's getter not conditonal on a browsing context

Tests: ...

Fixes #1794 and fixes #2697.

source

@@ -79701,11 +79701,8 @@ interface <dfn>BarProp</dfn> {
   these steps:</p>
 
   <ol>
-   <li><p>If this <code>Document</code> object does not have a <span
-   data-x="concept-document-bc">browsing context</span>, then return the empty string.
-
-   <li><p>Let <var>effectiveDomain</var> be this <code>Document</code>'s <span>origin</span>'s <span
-   data-x="concept-origin-effective-domain">effective domain</span>.
+   <li><p>Let <var>effectiveDomain</var> be this <code>Document</code> object's
+   <span>origin</span>'s <span data-x="concept-origin-effective-domain">effective domain</span>.
 
    <li><p>If <var>effectiveDomain</var> is null, then return the empty string.</p></li>
 
@@ -79726,8 +79723,8 @@ interface <dfn>BarProp</dfn> {
    flag</span> set, then throw a <span>"<code>SecurityError</code>"</span>
    <code>DOMException</code>.</p></li>
 
-   <li><p>Let <var>effectiveDomain</var> be this <code>Document</code>'s <span>origin</span>'s <span
-   data-x="concept-origin-effective-domain">effective domain</span>.
+   <li><p>Let <var>effectiveDomain</var> be this <code>Document</code> object's
+   <span>origin</span>'s <span data-x="concept-origin-effective-domain">effective domain</span>.
 
    <li><p>If <var>effectiveDomain</var> is null, then throw a
    <span>"<code>SecurityError</code>"</span> <code>DOMException</code>.</p></li>