Trying to fix SQLResultSetRowList's subscript operator to do type conversion

sdk/lib/web_sql/dart2js/web_sql_dart2js.dart

Index: sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
diff --git a/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart b/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
index 7af7f4511fe4ab3cc7da4bda53e1636fe23c0e73..6592ea87915f4b4bf0599fbe7780e6300cca6306 100644
--- a/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
+++ b/sdk/lib/web_sql/dart2js/web_sql_dart2js.dart
@@ -210,7 +210,7 @@ class SqlResultSet extends Interceptor {
 // http://www.w3.org/TR/webdatabase/#sqlresultsetrowlist
 @Experimental() // deprecated
 @Native("SQLResultSetRowList")
-class SqlResultSetRowList extends Interceptor with ListMixin<Map>, ImmutableListMixin<Map> implements JavaScriptIndexingBehavior, List<Map> {
+class SqlResultSetRowList extends Interceptor with ListMixin<Map>, ImmutableListMixin<Map> implements List<Map> {
   // To suppress missing implicit constructor warnings.
   factory SqlResultSetRowList._() { throw new UnsupportedError("Not supported"); }
 
@@ -222,7 +222,7 @@ class SqlResultSetRowList extends Interceptor with ListMixin<Map>, ImmutableList
     if (JS("bool", "# >>> 0 !== # || # >= #", index,
         index, index, length))
       throw new RangeError.index(index, this);
-    return JS("Map", "#[#]", this, index);
+    return this.item(index);
   }
   void operator[]=(int index, Map value) {
     throw new UnsupportedError("Cannot assign element of immutable List.");
@@ -264,8 +264,13 @@ class SqlResultSetRowList extends Interceptor with ListMixin<Map>, ImmutableList
 
   @DomName('SQLResultSetRowList.item')
   @DocsEditable()
-  @Creates('=Object')
-  Object item(int index) native;
+  Map item(int index) {
+    return convertNativeToDart_Dictionary(_item_1(index));
+  }
+  @JSName('item')
+  @DomName('SQLResultSetRowList.item')
+  @DocsEditable()
+  _item_1(index) native;
 }
 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a