Make dart:dom implementation types private so they don't muddle the docs.

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

Index: client/dom/generated/src/frog/KeyboardEvent.dart
diff --git a/client/dom/generated/src/frog/KeyboardEvent.dart b/client/dom/generated/src/frog/KeyboardEvent.dart
index 000defaa56e2eab1d0c5f39e7c46c4ce31899ebb..f01fd9aa7d8feea9e03248caae1eee08cbb598e8 100644
--- a/client/dom/generated/src/frog/KeyboardEvent.dart
+++ b/client/dom/generated/src/frog/KeyboardEvent.dart
@@ -1,5 +1,5 @@
 
-class KeyboardEventJs extends UIEventJs implements KeyboardEvent native "*KeyboardEvent" {
+class _KeyboardEventJs extends _UIEventJs implements KeyboardEvent native "*KeyboardEvent" {
 
   bool get altGraphKey() native "return this.altGraphKey;";
 
@@ -15,5 +15,5 @@ class KeyboardEventJs extends UIEventJs implements KeyboardEvent native "*Keyboa
 
   bool get shiftKey() native "return this.shiftKey;";
 
-  void initKeyboardEvent(String type, bool canBubble, bool cancelable, DOMWindowJs view, String keyIdentifier, int keyLocation, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, bool altGraphKey) native;
+  void initKeyboardEvent(String type, bool canBubble, bool cancelable, _DOMWindowJs view, String keyIdentifier, int keyLocation, bool ctrlKey, bool altKey, bool shiftKey, bool metaKey, bool altGraphKey) native;
 }