Get rid of a lot of () for getters.

lib/dom/src/GlobalProperties.dart

Index: lib/dom/src/GlobalProperties.dart
diff --git a/lib/dom/src/GlobalProperties.dart b/lib/dom/src/GlobalProperties.dart
index db49c95567ef876b992206df4b678459240c395f..0ef174856821395c2efb478d91c18a22c14a664d 100644
--- a/lib/dom/src/GlobalProperties.dart
+++ b/lib/dom/src/GlobalProperties.dart
@@ -2,16 +2,16 @@
 // 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.
 
-Window get window() {
+Window get window {
   return _NativeDomGlobalProperties.getWindow();
 }
 
 // TODO(vsm): Remove when prefixes are supported.
-Window get dom_window() {
+Window get dom_window {
   return _NativeDomGlobalProperties.getWindow();
 }
 
-Document get document() {
+Document get document {
   return _NativeDomGlobalProperties.getDocument();
 }