Remove DOMException conversion section

DOMException is an interface, and this doesn't add anything over the algorithms
for other interfaces.

index.bs

@@ -7998,31 +7998,6 @@ that correspond to the union’s [=member types=].
 </p>
 
 
-<h4 id="es-DOMException">DOMException</h4>
-
-IDL {{DOMException}} values are represented by
-ECMAScript Object values.
-
-<div id="es-to-DOMException" algorithm="convert an ECMAScript value to DOMException">
-
-    An ECMAScript value |V| is [=converted to an IDL value|converted=]
-    to an IDL {{DOMException}} value by running the following algorithm:
-
-    1.  If <a abstract-op>Type</a>(|V|) is not Object,
-        or |V| is not a platform object that represents a {{DOMException}},
-        then [=ECMAScript/throw=] a {{ECMAScript/TypeError}}.
-    1.  Return the IDL {{DOMException}} value that is a reference
-        to the same object as |V|.
-</div>
-
-<p id="DOMException-to-es">
-    The result of [=converted to an ECMAScript value|converting=]
-    an IDL {{DOMException}} value to an ECMAScript
-    value is the Object value that represents a reference to the same object that the
-    IDL {{DOMException}} represents.
-</p>
-
-
 <h4 id="es-buffer-source-types">Buffer source types</h4>
 
 Values of the IDL [=buffer source types=]