Get rid of a lot of () for getters.

lib/html/src/OverflowEventWrappingImplementation.dart

Index: lib/html/src/OverflowEventWrappingImplementation.dart
diff --git a/lib/html/src/OverflowEventWrappingImplementation.dart b/lib/html/src/OverflowEventWrappingImplementation.dart
index 60934daddcb105ead34543c35f8690dce460db2c..9c171832dbf732135075cc5c47e0f8b4c5e37c99 100644
--- a/lib/html/src/OverflowEventWrappingImplementation.dart
+++ b/lib/html/src/OverflowEventWrappingImplementation.dart
@@ -13,9 +13,9 @@ class OverflowEventWrappingImplementation extends EventWrappingImplementation im
     return LevelDom.wrapOverflowEvent(e);
   }
 
-  bool get horizontalOverflow() => _ptr.horizontalOverflow;
+  bool get horizontalOverflow => _ptr.horizontalOverflow;
 
-  int get orient() => _ptr.orient;
+  int get orient => _ptr.orient;
 
-  bool get verticalOverflow() => _ptr.verticalOverflow;
+  bool get verticalOverflow => _ptr.verticalOverflow;
 }