Get rid of a lot of () for getters.

samples/calculator/settings.dart

Index: samples/calculator/settings.dart
diff --git a/samples/calculator/settings.dart b/samples/calculator/settings.dart
index 0d8198791f016d76a09970d7bef02c961a2394eb..4e5238b7c341c19d725e57e26b9fb8856540f649 100644
--- a/samples/calculator/settings.dart
+++ b/samples/calculator/settings.dart
@@ -49,7 +49,7 @@ class Settings {
       "transparent" : "#333";
   }
 
-  bool get isOpen() => _dialogOpened;
+  bool get isOpen => _dialogOpened;
 
   /*
    * Optional MouseEvent if passed if the source of event is from outside of
@@ -71,7 +71,7 @@ class Settings {
     }
   }
 
-  bool get isSimple() => theme == THEME_SIMPLE;
-  bool get isButton() => theme == THEME_BUTTON;
+  bool get isSimple => theme == THEME_SIMPLE;
+  bool get isButton => theme == THEME_BUTTON;
 
 }