Get rid of a lot of () for getters.

lib/html/src/CssClassSet.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 - figure out whether classList exists, and if so use that
 // rather than the className property that is being used here.
 
 class _CssClassSet implements Set<String> {
 
   final _element;
@@ skipping 28 matching lines @@
   }
 
   bool some(bool f(String element)) {
     return _read().some(f);
   }
 
   bool isEmpty() {
     return _read().isEmpty();
   }
 
-  int get length() {
+  int get length {
     return _read().length;
   }
   // interface Collection - END
 
   // interface Set - BEGIN
   bool contains(String value) {
     return _read().contains(value);
   }
 
   void add(String value) {
@@ skipping 81 matching lines @@
   }
 
   String _formatSet(Set<String> s) {
     // TODO(mattsh) should be able to pass Set to String.joins http:/b/5398605
     List list = new List.from(s);
     return Strings.join(list, ' ');
   }
 
 }