Make most native types hidden.

client/dom/generated/src/frog/HTMLCollection.dart

 
-class HTMLCollection native "HTMLCollection" {
+class HTMLCollection native "*HTMLCollection" {
 
   int length;
 
   Node operator[](int index) native;
 
   void operator[]=(int index, Node value) {
     throw new UnsupportedOperationException("Cannot assign element of immutable List.");
   }
 
   Node item(int index) native;
 
   Node namedItem(String name) native;
 
   var dartObjectLocalStorage;
 
   String get typeName() native;
 }