Get rid of a lot of () for getters.

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