Add constructors to all the event classes.

client/html/src/DeviceOrientationEvent.dart

Index: client/html/src/DeviceOrientationEvent.dart
diff --git a/client/html/generated/src/interface/DeviceOrientationEvent.dart b/client/html/src/DeviceOrientationEvent.dart
similarity index 55%
rename from client/html/generated/src/interface/DeviceOrientationEvent.dart
rename to client/html/src/DeviceOrientationEvent.dart
index d66a9d5a19ef9f5192f4d68886d81443e220ad71..8fc3e6dcf02f47c4f5726b68e8119031f7ad4ec3 100644
--- a/client/html/generated/src/interface/DeviceOrientationEvent.dart
+++ b/client/html/src/DeviceOrientationEvent.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 DeviceOrientationEvent extends Event factory DeviceOrientationEventWrappingImplementation {
 
-interface DeviceOrientationEvent extends Event {
+  DeviceOrientationEvent(String type, double alpha, double beta, double gamma,
+      [bool canBubble, bool cancelable]);
 
   num get alpha();
 
   num get beta();
 
   num get gamma();
-
-  void initDeviceOrientationEvent(String type, bool bubbles, bool cancelable, num alpha, num beta, num gamma);
 }