Fix syntax error that resulted from badly converting a .forEach() to a for-in.

sky/sdk/lib/framework/fn2.dart

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 library fn;
 
 import 'app.dart';
 import 'dart:async';
 import 'dart:collection';
 import 'dart:mirrors';
@@ skipping 58 matching lines @@
     try {
       _notifyingMountStatus = true;
       for (UINode node in _mountedChanged) {
         if (node._wasMounted != node._mounted) {
           if (node._mounted)
             node._didMount();
           else
             node._didUnmount();
           node._wasMounted = node._mounted;
         }
-      });
+      }
       _mountedChanged.clear();
     } finally {
       _notifyingMountStatus = false;
     }
   }
   void _didMount() { }
   void _didUnmount() { }
 
   RenderObject root;
 
@@ skipping 917 matching lines @@
     assert(root.parent is RenderView);
   }
 }
 
 class Text extends Component {
   Text(this.data) : super(key: '*text*');
   final String data;
   bool get interchangeable => true;
   UINode build() => new Paragraph(text: data);
 }