Get rid of a lot of () for getters.

lib/html/src/TransitionEventWrappingImplementation.dart

Index: lib/html/src/TransitionEventWrappingImplementation.dart
diff --git a/lib/html/src/TransitionEventWrappingImplementation.dart b/lib/html/src/TransitionEventWrappingImplementation.dart
index 396efb501639dcddf5e452e3ef562c8a23c5fb90..24386ff1e4a9f090294a1c5809662c3f4a594227 100644
--- a/lib/html/src/TransitionEventWrappingImplementation.dart
+++ b/lib/html/src/TransitionEventWrappingImplementation.dart
@@ -7,7 +7,7 @@ class TransitionEventWrappingImplementation extends EventWrappingImplementation
 
   TransitionEventWrappingImplementation._wrap(ptr) : super._wrap(ptr);
 
-  static String get _eventName() {
+  static String get _eventName {
     if (_name != null) return _name;
 
     try {
@@ -28,7 +28,7 @@ class TransitionEventWrappingImplementation extends EventWrappingImplementation
     return LevelDom.wrapTransitionEvent(e);
   }
 
-  num get elapsedTime() => _ptr.elapsedTime;
+  num get elapsedTime => _ptr.elapsedTime;
 
-  String get propertyName() => _ptr.propertyName;
+  String get propertyName => _ptr.propertyName;
 }