Get rid of a lot of () for getters.

lib/html/src/ProgressEventWrappingImplementation.dart

Index: lib/html/src/ProgressEventWrappingImplementation.dart
diff --git a/lib/html/src/ProgressEventWrappingImplementation.dart b/lib/html/src/ProgressEventWrappingImplementation.dart
index f1982b41d1462bc51a8e39c3451cf6573a21359c..97559236a42718a06651a43b9b6bb7d1d5344499 100644
--- a/lib/html/src/ProgressEventWrappingImplementation.dart
+++ b/lib/html/src/ProgressEventWrappingImplementation.dart
@@ -14,9 +14,9 @@ class ProgressEventWrappingImplementation extends EventWrappingImplementation im
     return LevelDom.wrapProgressEvent(e);
   }
 
-  bool get lengthComputable() => _ptr.lengthComputable;
+  bool get lengthComputable => _ptr.lengthComputable;
 
-  int get loaded() => _ptr.loaded;
+  int get loaded => _ptr.loaded;
 
-  int get total() => _ptr.total;
+  int get total => _ptr.total;
 }