Get rid of a lot of () for getters.

lib/html/src/dart2js_DOMImplementation.dart

 // Copyright (c) 2012, 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(vsm): Unify with Dartium version.
 class _DOMWindowCrossFrameImpl implements Window {
   // Private window.
   _WindowImpl _window;
 
   // Fields.
   // TODO(vsm): Implement history and location getters.
 
   // TODO(vsm): Add frames to navigate subframes.  See 2312.
 
-  bool get closed() => _closed(_window);
+  bool get closed => _closed(_window);
   static bool _closed(win) native "return win.closed;";
 
-  Window get opener() => _createSafe(_opener(_window));
+  Window get opener => _createSafe(_opener(_window));
   static Window _opener(win) native "return win.opener;";
 
-  Window get parent() => _createSafe(_parent(_window));
+  Window get parent => _createSafe(_parent(_window));
   static Window _parent(win) native "return win.parent;";
 
-  Window get top() => _createSafe(_top(_window));
+  Window get top => _createSafe(_top(_window));
   static Window _top(win) native "return win.top;";
 
   // Methods.
   void focus() => _focus(_window);
   static void _focus(win) native "win.focus()";
 
   void blur() => _blur(_window);
   static void _blur(win) native "win.blur()";
 
   void close() => _close(_window);
@@ skipping 25 matching lines @@
 
   static Window _createSafe(w) {
     if (w === window) {
       return w;
     } else {
       // TODO(vsm): Cache or implement equality.
       return new _DOMWindowCrossFrameImpl(w);
     }
   }
 }