Remove NoInterface attribute from DOMRectList. Issue #233.

Author: dirkschulze

geometry/Overview.bs

@@ -414,8 +414,7 @@ steps:
 <h2 id=DOMRectList>The DOMRectList interface</h2>
 
 <pre class=idl>
-[NoInterfaceObject,
- LegacyArrayClass]
+[LegacyArrayClass]
 interface DOMRectList {
     readonly attribute unsigned long length;
     getter DOMRect? item(unsigned long index);