Do not allow named window targeting with noopener

This appears to match all existing browsers' behavior. Fixes whatwg#11291.

Author: domenic

source

@@ -99543,15 +99543,14 @@ interface <dfn interface>NotRestoredReasons</dfn> {
    data-x="nav-traversable">traversable navigable</span>.</p></li>
 
    <li><p>Otherwise, if <var>name</var> is not an <span>ASCII case-insensitive</span> match for
-   "<code data-x="">_blank</code>", and there exists a <span>navigable</span> that is the result of
-   <span data-x="find a navigable by target name">finding a navigable by target name</span> given
-   <var>name</var> and <var>currentNavigable</var>, set <var>chosen</var> to that
-   navigable.</p></li>
+   "<code data-x="">_blank</code>" and <var>noopener</var> is false, then set <var>chosen</var> to
+   the result of <span data-x="find a navigable by target name">finding a navigable by target
+   name</span> given <var>name</var> and <var>currentNavigable</var>.</p></li>
 
    <li>
-    <p>Otherwise, a new <span>top-level traversable</span> is being requested, and what happens
-    depends on the user agent's configuration and abilities &mdash; it is determined by the rules
-    given for the first applicable option from the following list:</p>
+    <p>If <var>chosen</var> is null, then a new <span>top-level traversable</span> is being
+    requested, and what happens depends on the user agent's configuration and abilities &mdash; it
+    is determined by the rules given for the first applicable option from the following list:</p>
 
     <dl class="switch">
      <dt id="popup-blocker">If <var>currentNavigable</var>'s <span data-x="nav-window">active