Add constructors to all the event classes.

client/html/src/HashChangeEvent.dart

Index: client/html/src/HashChangeEvent.dart
diff --git a/client/html/generated/src/interface/HashChangeEvent.dart b/client/html/src/HashChangeEvent.dart
similarity index 58%
rename from client/html/generated/src/interface/HashChangeEvent.dart
rename to client/html/src/HashChangeEvent.dart
index 3421f512b63df433ab60247642b2725e0aa31fef..dd85061c9498f352acfa0d5ec18ba43416d3c3ee 100644
--- a/client/html/generated/src/interface/HashChangeEvent.dart
+++ b/client/html/src/HashChangeEvent.dart
@@ -2,13 +2,12 @@
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-// WARNING: Do not edit - generated code.
+interface HashChangeEvent extends Event factory HashChangeEventWrappingImplementation {
 
-interface HashChangeEvent extends Event {
+  HashChangeEvent(String type, String oldURL, String newURL, [bool canBubble,
+      bool cancelable]);
 
   String get newURL();
 
   String get oldURL();
-
-  void initHashChangeEvent(String type, bool canBubble, bool cancelable, String oldURL, String newURL);
 }