Drop the name propagation for the object element's name attribute

Introduced with 0a2ab22, but it appears
that <object name> as a target for <a target> was never implemented.

Fixes whatwg#1623.

source

@@ -29646,12 +29646,6 @@ interface <dfn>HTMLObjectElement</dfn> : <span>HTMLElement</span> {
   <p>The <span>task source</span> for the <span data-x="concept-task">tasks</span> mentioned in this
   section is the <span>DOM manipulation task source</span>.</p>
 
-  <p>Whenever the <code data-x="attr-object-name">name</code> attribute is set, if the
-  <code>object</code> element has a nested <span>browsing context</span>, its <span data-x="browsing
-  context name">name</span> must be changed to the new value. If the attribute is removed, if the
-  <code>object</code> element has a <span>browsing context</span>, the <span>browsing context
-  name</span> must be set to the empty string.</p>
-
   </div>
 
   <p>The <code data-x="attr-hyperlink-usemap">usemap</code> attribute, if present while the