Make DOMType the root of DOM implementation types.

client/dom/generated/src/frog/MessageEvent.dart

Index: client/dom/generated/src/frog/MessageEvent.dart
diff --git a/client/dom/generated/src/frog/MessageEvent.dart b/client/dom/generated/src/frog/MessageEvent.dart
index 2e49a4506201ae55107003c2f4fa5c92f068d12a..d67720cfd8b019e189982f32c43ffaa0daae7ccd 100644
--- a/client/dom/generated/src/frog/MessageEvent.dart
+++ b/client/dom/generated/src/frog/MessageEvent.dart
@@ -1,5 +1,5 @@
 
-class MessageEventJS extends EventJS implements MessageEvent native "*MessageEvent" {
+class MessageEventJs extends EventJs implements MessageEvent native "*MessageEvent" {
 
   Object get data() native "return this.data;";
 
@@ -9,9 +9,9 @@ class MessageEventJS extends EventJS implements MessageEvent native "*MessageEve
 
   List get ports() native "return this.ports;";
 
-  DOMWindowJS get source() native "return this.source;";
+  DOMWindowJs get source() native "return this.source;";
 
-  void initMessageEvent(String typeArg, bool canBubbleArg, bool cancelableArg, Object dataArg, String originArg, String lastEventIdArg, DOMWindowJS sourceArg, List messagePorts) native;
+  void initMessageEvent(String typeArg, bool canBubbleArg, bool cancelableArg, Object dataArg, String originArg, String lastEventIdArg, DOMWindowJs sourceArg, List messagePorts) native;
 
-  void webkitInitMessageEvent(String typeArg, bool canBubbleArg, bool cancelableArg, Object dataArg, String originArg, String lastEventIdArg, DOMWindowJS sourceArg, List transferables) native;
+  void webkitInitMessageEvent(String typeArg, bool canBubbleArg, bool cancelableArg, Object dataArg, String originArg, String lastEventIdArg, DOMWindowJs sourceArg, List transferables) native;
 }