Use reserved client's top-level origin

fetch.bs

@@ -2057,15 +2057,10 @@ clearly stipulates that <a>connections</a> are keyed on
 given <var>request</var>, run these steps:
 
 <ol>
- <li><p>If <var>request</var> is a <a>navigation request</a>, set <var>environmentSettings</var> to
- <var>request</var>'s <a for=request>reserved client</a>'s
- <a for="environment">target browsing context</a>'s <a>active document</a>'s
- <a>environment settings object</a>. Otherwise let <var>environmentSettings</var> be
- <var>request</var>'s <a for=request>client</a>.
-
- <li><p>If <var>environmentSettings</var> is null, then return null.
-
- <li><p>Let <var>topLevelOrigin</var> be <var>environmentSettings</var>'s
+ <li><p>If <var>request</var> is a <a>navigation request</a>, set <var>topLevelOrigin</var>
+ to <var>request</var>'s <a for=request>reserved client</a>'s
+ <a for="environment">top-level origin</a>. Otherwise, if <var>environmentSettings</var> is
+ null, return null, else, set <var>topLevelOrigin</var> to <var>environmentSettings</var>'s
  <a for="environment settings object">top-level origin</a>.
 
  <li><p>Let <var>topLevelSite</var> be the result of