Get rid of a lot of () for getters.

lib/html/src/ProgressEventWrappingImplementation.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.
 
 class ProgressEventWrappingImplementation extends EventWrappingImplementation implements ProgressEvent {
   ProgressEventWrappingImplementation._wrap(ptr) : super._wrap(ptr);
 
   factory ProgressEventWrappingImplementation(String type, int loaded,
       [bool canBubble = true, bool cancelable = true,
       bool lengthComputable = false, int total = 0]) {
     final e = dom.document.createEvent("ProgressEvent");
     e.initProgressEvent(type, canBubble, cancelable, lengthComputable, loaded,
         total);
     return LevelDom.wrapProgressEvent(e);
   }
 
-  bool get lengthComputable() => _ptr.lengthComputable;
+  bool get lengthComputable => _ptr.lengthComputable;
 
-  int get loaded() => _ptr.loaded;
+  int get loaded => _ptr.loaded;
 
-  int get total() => _ptr.total;
+  int get total => _ptr.total;
 }