Change a couple vars -> finals.

client/html/src/ElementWrappingImplementation.dart

 // Copyright (c) 2011, 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.
 
 // TODO(jacobr): use Lists.dart to remove some of the duplicated functionality.
 class _ChildrenElementList implements ElementList {
   // Raw Element.
   final _element;
   final _childElements;
 
@@ skipping 131 matching lines @@
     return this[0];
   }
 
   void forEach(void f(Element element)) {
     for (Element el in this) {
       f(el);
     }
   }
 
   Collection map(f(Element element)) {
-    var out = [];
+    final out = [];
     for (Element el in this) {
       out.add(f(el));
     }
     return out;
   }
 
   ElementList filter(bool f(Element element)) {
-    var out = new _ElementList([]);
+    final out = new _ElementList([]);
     for (Element el in this) {
       if (f(el)) out.add(el);
     }
     return out;
   }
 
   bool every(bool f(Element element)) {
     for(Element element in this) {
       if (!f(element)) {
         return false;
@@ skipping 608 matching lines @@
 
   ElementEvents get on() {
     if (_on === null) {
       _on = new ElementEventsImplementation._wrap(_ptr);
     }
     return _on;
   }
 
   Element clone(bool deep) => super.clone(deep);
 }