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

sdk/lib/web_sql/dart2js/web_sql_dart2js.dart

 /**
  * An API for storing data in the browser that can be queried with SQL.
  *
  * **Caution:** this specification is no longer actively maintained by the Web
  * Applications Working Group and may be removed at any time.
  * See [the W3C Web SQL Database specification](http://www.w3.org/TR/webdatabase/)
  * for more information.
  *
  * The [dart:indexed_db] APIs is a recommended alternatives.
  */
@@ skipping 192 matching lines @@
 // 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
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable()
 @DomName('SQLResultSetRowList')
 // 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"); }
 
   @DomName('SQLResultSetRowList.length')
   @DocsEditable()
   int get length => JS("int", "#.length", this);
 
   Map operator[](int index) {
     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.");
   }
   // -- start List<Map> mixins.
   // Map is the element type.
 
 
   set length(int value) {
     throw new UnsupportedError("Cannot resize immutable List.");
@@ skipping 21 matching lines @@
     }
     if (len == 0) throw new StateError("No elements");
     throw new StateError("More than one element");
   }
 
   Map elementAt(int index) => this[index];
   // -- end List<Map> mixins.
 
   @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
 // BSD-style license that can be found in the LICENSE file.
 
 
 @DocsEditable()
 @DomName('SQLTransaction')
 @SupportedBrowser(SupportedBrowser.CHROME)
 @SupportedBrowser(SupportedBrowser.SAFARI)
 @Experimental()
 // http://www.w3.org/TR/webdatabase/#sqltransaction
 @deprecated // deprecated
 @Native("SQLTransaction")
 class SqlTransaction extends Interceptor {
   // To suppress missing implicit constructor warnings.
   factory SqlTransaction._() { throw new UnsupportedError("Not supported"); }
 
   @DomName('SQLTransaction.executeSql')
   @DocsEditable()
   void executeSql(String sqlStatement, [List arguments, SqlStatementCallback callback, SqlStatementErrorCallback errorCallback]) native;
 }