Faces Spec #1871 - remove composite:extension

impl/src/main/java/org/apache/myfaces/view/facelets/tag/composite/CompositeComponentBeanInfo.java

@@ -51,7 +51,6 @@
  *    composite:valueHolder
  *    composite:editableValueHolder
  *    composite:actionSource
- *    composite:extension
  *    
  *    must deal with this class, so it is expected methods that manipulate
  *    data here are called from their tag handlers.

impl/src/main/java/org/apache/myfaces/view/facelets/tag/composite/CompositeLibrary.java

@@ -41,9 +41,7 @@ public CompositeLibrary()
         addTagHandler("clientBehavior", ClientBehaviorHandler.class);
 
         addTagHandler("editableValueHolder", EditableValueHolderHandler.class);
-
-        addTagHandler("extension", ExtensionHandler.class);
-
+
         addTagHandler("facet", FacetHandler.class);
 
         addTagHandler("implementation", ImplementationHandler.class);