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

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

Index: client/dom/generated/src/frog/SVGGElement.dart
diff --git a/client/dom/generated/src/frog/SVGGElement.dart b/client/dom/generated/src/frog/SVGGElement.dart
index 667a528ba61f22eef977e6c89b61f05c2a8efe3b..aa88b7d51c496a759f99ccab612c569793f31c30 100644
--- a/client/dom/generated/src/frog/SVGGElement.dart
+++ b/client/dom/generated/src/frog/SVGGElement.dart
@@ -1,13 +1,13 @@
 
-class SVGGElementJs extends SVGElementJs implements SVGGElement native "*SVGGElement" {
+class _SVGGElementJs extends _SVGElementJs implements SVGGElement native "*SVGGElement" {
 
   // From SVGTests
 
-  SVGStringListJs get requiredExtensions() native "return this.requiredExtensions;";
+  _SVGStringListJs get requiredExtensions() native "return this.requiredExtensions;";
 
-  SVGStringListJs get requiredFeatures() native "return this.requiredFeatures;";
+  _SVGStringListJs get requiredFeatures() native "return this.requiredFeatures;";
 
-  SVGStringListJs get systemLanguage() native "return this.systemLanguage;";
+  _SVGStringListJs get systemLanguage() native "return this.systemLanguage;";
 
   bool hasExtension(String extension) native;
 
@@ -23,31 +23,31 @@ class SVGGElementJs extends SVGElementJs implements SVGGElement native "*SVGGEle
 
   // From SVGExternalResourcesRequired
 
-  SVGAnimatedBooleanJs get externalResourcesRequired() native "return this.externalResourcesRequired;";
+  _SVGAnimatedBooleanJs get externalResourcesRequired() native "return this.externalResourcesRequired;";
 
   // From SVGStylable
 
-  SVGAnimatedStringJs get className() native "return this.className;";
+  _SVGAnimatedStringJs get className() native "return this.className;";
 
-  CSSStyleDeclarationJs get style() native "return this.style;";
+  _CSSStyleDeclarationJs get style() native "return this.style;";
 
-  CSSValueJs getPresentationAttribute(String name) native;
+  _CSSValueJs getPresentationAttribute(String name) native;
 
   // From SVGTransformable
 
-  SVGAnimatedTransformListJs get transform() native "return this.transform;";
+  _SVGAnimatedTransformListJs get transform() native "return this.transform;";
 
   // From SVGLocatable
 
-  SVGElementJs get farthestViewportElement() native "return this.farthestViewportElement;";
+  _SVGElementJs get farthestViewportElement() native "return this.farthestViewportElement;";
 
-  SVGElementJs get nearestViewportElement() native "return this.nearestViewportElement;";
+  _SVGElementJs get nearestViewportElement() native "return this.nearestViewportElement;";
 
-  SVGRectJs getBBox() native;
+  _SVGRectJs getBBox() native;
 
-  SVGMatrixJs getCTM() native;
+  _SVGMatrixJs getCTM() native;
 
-  SVGMatrixJs getScreenCTM() native;
+  _SVGMatrixJs getScreenCTM() native;
 
-  SVGMatrixJs getTransformToElement(SVGElementJs element) native;
+  _SVGMatrixJs getTransformToElement(_SVGElementJs element) native;
 }