Get rid of a lot of () for getters.

lib/html/src/StorageEventWrappingImplementation.dart

Index: lib/html/src/StorageEventWrappingImplementation.dart
diff --git a/lib/html/src/StorageEventWrappingImplementation.dart b/lib/html/src/StorageEventWrappingImplementation.dart
index 4852a4cea2b1e98694597c67898c5a64019fb341..4a79172510dfee1389810ddd08259b8e2da4745b 100644
--- a/lib/html/src/StorageEventWrappingImplementation.dart
+++ b/lib/html/src/StorageEventWrappingImplementation.dart
@@ -15,13 +15,13 @@ class StorageEventWrappingImplementation extends EventWrappingImplementation imp
     return LevelDom.wrapStorageEvent(e);
   }
 
-  String get key() => _ptr.key;
+  String get key => _ptr.key;
 
-  String get newValue() => _ptr.newValue;
+  String get newValue => _ptr.newValue;
 
-  String get oldValue() => _ptr.oldValue;
+  String get oldValue => _ptr.oldValue;
 
-  Storage get storageArea() => LevelDom.wrapStorage(_ptr.storageArea);
+  Storage get storageArea => LevelDom.wrapStorage(_ptr.storageArea);
 
-  String get url() => _ptr.url;
+  String get url => _ptr.url;
 }