Add constructors to all the event classes.

client/html/generated/src/wrapping/_CustomEventWrappingImplementation.dart

Index: client/html/generated/src/wrapping/_CustomEventWrappingImplementation.dart
diff --git a/client/html/generated/src/wrapping/_CustomEventWrappingImplementation.dart b/client/html/generated/src/wrapping/_CustomEventWrappingImplementation.dart
deleted file mode 100644
index c08e8a23c1a9ebcf9338b9a0f742ff4d536b6fec..0000000000000000000000000000000000000000
--- a/client/html/generated/src/wrapping/_CustomEventWrappingImplementation.dart
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
-// 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.
-
-class CustomEventWrappingImplementation extends EventWrappingImplementation implements CustomEvent {
-  CustomEventWrappingImplementation._wrap(ptr) : super._wrap(ptr) {}
-
-  String get detail() { return _ptr.detail; }
-
-  void initCustomEvent(String typeArg, bool canBubbleArg, bool cancelableArg, Object detailArg) {
-    _ptr.initCustomEvent(typeArg, canBubbleArg, cancelableArg, LevelDom.unwrapMaybePrimitive(detailArg));
-    return;
-  }
-}