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

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

 
-class NavigatorJs extends DOMTypeJs implements Navigator native "*Navigator" {
+class _NavigatorJs extends _DOMTypeJs implements Navigator native "*Navigator" {
 
   String get appCodeName() native "return this.appCodeName;";
 
   String get appName() native "return this.appName;";
 
   String get appVersion() native "return this.appVersion;";
 
   bool get cookieEnabled() native "return this.cookieEnabled;";
 
-  GeolocationJs get geolocation() native "return this.geolocation;";
+  _GeolocationJs get geolocation() native "return this.geolocation;";
 
   String get language() native "return this.language;";
 
-  DOMMimeTypeArrayJs get mimeTypes() native "return this.mimeTypes;";
+  _DOMMimeTypeArrayJs get mimeTypes() native "return this.mimeTypes;";
 
   bool get onLine() native "return this.onLine;";
 
   String get platform() native "return this.platform;";
 
-  DOMPluginArrayJs get plugins() native "return this.plugins;";
+  _DOMPluginArrayJs get plugins() native "return this.plugins;";
 
   String get product() native "return this.product;";
 
   String get productSub() native "return this.productSub;";
 
   String get userAgent() native "return this.userAgent;";
 
   String get vendor() native "return this.vendor;";
 
   String get vendorSub() native "return this.vendorSub;";
 
   void getStorageUpdates() native;
 
   bool javaEnabled() native;
 
   void registerProtocolHandler(String scheme, String url, String title) native;
 }