Updates for js_array

tool/input_sdk/lib/internal/list.dart

Index: tool/input_sdk/lib/internal/list.dart
diff --git a/tool/input_sdk/lib/internal/list.dart b/tool/input_sdk/lib/internal/list.dart
index 36322034efa5cac3b53040fe9d81e483b45c3c00..6e975e0d0cf930ed760725b4077c7e9d002c0148 100644
--- a/tool/input_sdk/lib/internal/list.dart
+++ b/tool/input_sdk/lib/internal/list.dart
@@ -123,7 +123,7 @@ abstract class UnmodifiableListMixin<E> implements List<E> {
   }
 
   /** This operation is not supported by an unmodifiable list. */
-  E insert(int index, E value) {
+  void insert(int index, E element) {
     throw new UnsupportedError(
         "Cannot add to an unmodifiable list");
   }