Revert "Simplify quota"

This reverts commit 5be8047.

Author: noamr

fetch.bs

@@ -7057,20 +7057,24 @@ descendants share a quota of 384 kibibytes. That value is computed as such:
    <dd>0
   </dl>
 
+ <li>
+  <p><a for=list>For each</a> <var>navigable</var> in <var>controlDocument</var>'s
+  <a>node navigable</a>'s <a>descendant navigables</a> whose <a>container document</a>'s
+  <a>deferred-fetch control document</a> is <var>controlDocument</var>, decrement <var>quota</var>
+  by <var>navigable</var>'s <a>navigable container</a>'s <a>reserved deferred-fetch quota</a>.
+
+  <p class=note>Delegate some of the quota to nested documents that reserved it.
+
+ <li><p>If <var>quota</var> is equal or less than 0, then return 0.
+
  <li><p>Let <var>quotaForRequestOrigin</var> be 64 kibibytes.
 
  <li>
   <p><a for=list>For each</a> <var>navigable</var> in <var>controlDocument</var>'s
-  <a>node navigable</a>'s <a>inclusive descendant navigables</a> whose
-  <a for=navigable>active document</a>'s <a>deferred-fetch control document</a> is
-  <var>controlDocument</var>:
+  <a>node navigable</a>'s <a>descendant navigables</a> whose <a for=navigable>active document</a>'s
+  <a>deferred-fetch control document</a> is <var>controlDocument</var>:
 
   <ol>
-   <li><p><a for=list>For each</a> <var>container</var> in <var>navigable</var>'s
-   <a for=navigable>active document</a>'s <a>shadow-including inclusive descendants</a> which is a
-   <a>navigable container</a>, decrement <var>quota</var> by <var>container</var>'s
-   <a>reserved deferred-fetch quota</a>.
-
    <li>
     <p><a for=list>For each</a> <a>deferred fetch record</a> <var>deferredRecord</var> of
     <var>controlDocument</var>'s <a>fetch group</a>'s