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

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

 
-class SVGViewSpecJs extends SVGZoomAndPanJs implements SVGViewSpec native "*SVGViewSpec" {
+class _SVGViewSpecJs extends _SVGZoomAndPanJs implements SVGViewSpec native "*SVGViewSpec" {
 
   String get preserveAspectRatioString() native "return this.preserveAspectRatioString;";
 
-  SVGTransformListJs get transform() native "return this.transform;";
+  _SVGTransformListJs get transform() native "return this.transform;";
 
   String get transformString() native "return this.transformString;";
 
   String get viewBoxString() native "return this.viewBoxString;";
 
-  SVGElementJs get viewTarget() native "return this.viewTarget;";
+  _SVGElementJs get viewTarget() native "return this.viewTarget;";
 
   String get viewTargetString() native "return this.viewTargetString;";
 
   // From SVGFitToViewBox
 
-  SVGAnimatedPreserveAspectRatioJs get preserveAspectRatio() native "return this.preserveAspectRatio;";
+  _SVGAnimatedPreserveAspectRatioJs get preserveAspectRatio() native "return this.preserveAspectRatio;";
 
-  SVGAnimatedRectJs get viewBox() native "return this.viewBox;";
+  _SVGAnimatedRectJs get viewBox() native "return this.viewBox;";
 }