Don't compute relatives twice

Author: noamr

fetch.bs

@@ -6958,18 +6958,19 @@ This specification defined a <a>policy-controlled feature</a> identified by the
      <a for="deferred fetch record">request</a>'s <a for=request>URL</a>'s <a for=url>origin</a> is
      <a>same origin</a> with <var>origin</var>, then decrement <var>remainingQuotaForOrigin</var> by
      <var>length</var>.
+
+     <li><p>Let <var>relevantContainers</var> be all the <a>shadow-including descendant</a> of
+     <var>navigable</var>'s <a for=navigable>active document</a> which are a
+     <a>navigable container</a>.
+
+     <li><p><a for=list>For each</a> <var>descendantContainer</var> of
+     <var>relevantContainers</var>, if <var>relativeNavigables</var> does not
+     <a for=list>contain</a> <var>descendantContainer</var>, then decrement
+     <var>remainingTotalQuota</var> by the <a>initial subframe deferred fetch quota</a> given
+     <var>descendantContainer</var>'s <a>deferred fetch policy</a>.
     </ol>
    </li>
 
-   <li><p>Let <var>relevantContainers</var> be « ».
-   <li><p><a for=list>For each</a> <var>relative</var> in <var>navigable</var>'s
-   <a>deferred fetch quota-sharing navigables</a>, <a for=list>extend</a>
-   <var>relevantContainers</var> with every <a>shadow-including descendant</a> of
-   <var>relative</var> which is a <a>navigable container</a>.
-
-   <li><p><a for=list>For each</a> <var>descendantContainer</var> of <var>relevantContainers</var>,
-   decrement <var>remainingTotalQuota</var> by the <a>initial subframe deferred fetch quota</a>
-   given <var>descendantContainer</var>'s <a>deferred fetch policy</a>.
   </ol>
  </li>