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

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

Index: client/dom/generated/src/frog/SVGZoomEvent.dart
diff --git a/client/dom/generated/src/frog/SVGZoomEvent.dart b/client/dom/generated/src/frog/SVGZoomEvent.dart
index b0b91c77f4d003659871aeb343900e41ace96e5a..208563f6af132ff2068d80bcce5d7360a6e785b7 100644
--- a/client/dom/generated/src/frog/SVGZoomEvent.dart
+++ b/client/dom/generated/src/frog/SVGZoomEvent.dart
@@ -1,13 +1,13 @@
 
-class SVGZoomEventJs extends UIEventJs implements SVGZoomEvent native "*SVGZoomEvent" {
+class _SVGZoomEventJs extends _UIEventJs implements SVGZoomEvent native "*SVGZoomEvent" {
 
   num get newScale() native "return this.newScale;";
 
-  SVGPointJs get newTranslate() native "return this.newTranslate;";
+  _SVGPointJs get newTranslate() native "return this.newTranslate;";
 
   num get previousScale() native "return this.previousScale;";
 
-  SVGPointJs get previousTranslate() native "return this.previousTranslate;";
+  _SVGPointJs get previousTranslate() native "return this.previousTranslate;";
 
-  SVGRectJs get zoomRectScreen() native "return this.zoomRectScreen;";
+  _SVGRectJs get zoomRectScreen() native "return this.zoomRectScreen;";
 }