Add constructors to all the event classes.

client/html/src/CloseEvent.dart

Index: client/html/src/CloseEvent.dart
diff --git a/client/html/generated/src/interface/CloseEvent.dart b/client/html/src/CloseEvent.dart
similarity index 58%
rename from client/html/generated/src/interface/CloseEvent.dart
rename to client/html/src/CloseEvent.dart
index c189dffbeb71d33de61f174ffba71947388d4603..c3ed441f50d9e4e7b7be12f930a2b79e9a8c9784 100644
--- a/client/html/generated/src/interface/CloseEvent.dart
+++ b/client/html/src/CloseEvent.dart
@@ -2,15 +2,14 @@
 // 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 CloseEvent extends Event factory CloseEventWrappingImplementation {
 
-interface CloseEvent extends Event {
+  CloseEvent(String type, int code, String reason,
+      [bool canBubble, bool cancelable, bool wasClean]);
 
   int get code();
 
   String get reason();
 
   bool get wasClean();
-
-  void initCloseEvent(String typeArg, bool canBubbleArg, bool cancelableArg, bool wasCleanArg, int codeArg, String reasonArg);
 }