Remove DOMStringList definition (Resolves #28)

Following whatwg/html@a830aef the definition of DOMStringList is now in [HTML].

index.bs

@@ -5040,73 +5040,6 @@ event handler for the <code>error</code> event.
   the <code>success</code> event fires.
 </aside>
 
-<!-- ============================================================ -->
-<h3 id=domstringlist-api>The {{DOMStringList}} interface</h3>
-<!-- ============================================================ -->
-
-The {{DOMStringList}} interface represents an immutable ordered
-collection of zero or more {{DOMString}} values. The items in a
-{{DOMStringList}} are accessible via an integral index, starting from
-zero.
-
-<aside class=note>
-  The {{DOMStringList}} interface was previously defined in
-  [[DOM-Level-3-core]] but has been removed from the current versions
-  of [[DOM]] and is now only referenced in this specification. It is
-  hoped that in the future all uses of this type can be replaced by
-  the conceptually similar <code>FrozenArray&lt;DOMString&gt;</code>
-  to enable the use of other [=Array=] methods, but retaining support
-  for the {{DOMStringList/contains()}} method for compatibility with
-  deployed content.
-</aside>
-
-<pre class=idl>
-interface DOMStringList {
-    readonly attribute unsigned long length;
-    getter DOMString (unsigned long index);
-    DOMString? item(unsigned long index);
-
-    boolean contains(DOMString str);
-};
-</pre>
-
-<div class=note>
-  <dl class=domintro>
-    <dt><var>list</var> . {{DOMStringList/length}}</dt>
-    <dd>
-      Returns the length of the list.
-    </dd>
-    <dt><var>list</var> [ <var>index</var> ]</dt>
-    <dt><var>list</var> . {{DOMStringList/item()|item}}(<var>index</var>)</dt>
-    <dd>
-      Returns the |index|th item in the list.
-    </dd>
-    <dt><var>list</var> . {{DOMStringList/contains()|contains}}(<var>string</var>)</dt>
-    <dd>
-      Returns true if the list contains |string|, or false otherwise.
-    </dd>
-  </dl>
-</div>
-
-The [=supported property indices=] for a {{DOMStringList}} |list|
-are the numbers zero to the number of items in |list| minus one.
-If |list| has no items, it has no [=supported property indices=].
-
-To [=determine the value of an indexed property=] for a given index
-|index| in a {{DOMStringList}} |list|, return the |index|<sup>th</sup>
-item in |list|.
-
-The <dfn attribute for=DOMStringList>length</dfn> attribute's
-getter must return the number of items in the collection.
-
-The <dfn method for=DOMStringList>item(|index|)</dfn> method must
-return the |index|<sup>th</sup> item in the collection, or null
-if there are less than |index| + 1 items in the collection.
-
-The <dfn method for=DOMStringList>contains(|str|)</dfn> method must
-return true if |str| is equal to any item in the collection, and false
-otherwise.
-
 
 <!-- ============================================================ -->
 <h2 id=algorithms>Algorithms</h2>
@@ -6915,9 +6848,6 @@ document's Revision History</a>.
     <a href="https://github.com/w3c/IndexedDB/issues/77">bug #79</a>,
     <a href="https://github.com/w3c/IndexedDB/issues/77">bug #81</a>)
 
-* Added {{DOMStringList}}.
-    (<a href="https://github.com/w3c/IndexedDB/issues/28">bug #28</a>)
-
 
 <!-- ============================================================ -->
 <h2 id=acknowledgements>Acknowledgements</h2>