Convert NoMoreElementsException and EmptyQueueException to StateError.

lib/html/src/_ListIterators.dart

Index: lib/html/src/_ListIterators.dart
diff --git a/lib/html/src/_ListIterators.dart b/lib/html/src/_ListIterators.dart
index 039eda61c645951468972ba5abc0c40892e79406..4dd7745cc21e3c36329ddc2e9c4b96dc1210d05e 100644
--- a/lib/html/src/_ListIterators.dart
+++ b/lib/html/src/_ListIterators.dart
@@ -23,7 +23,7 @@ class _VariableSizeListIterator<T> implements Iterator<T> {
 
   T next() {
     if (!hasNext) {
-      throw const NoMoreElementsException();
+      throw new StateError("No more elements");
     }
     return _array[_pos++];
   }