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

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

 
-class HTMLObjectElementJs extends HTMLElementJs implements HTMLObjectElement native "*HTMLObjectElement" {
+class _HTMLObjectElementJs extends _HTMLElementJs implements HTMLObjectElement native "*HTMLObjectElement" {
 
   String get align() native "return this.align;";
 
   void set align(String value) native "this.align = value;";
 
   String get archive() native "return this.archive;";
 
   void set archive(String value) native "this.archive = value;";
 
   String get border() native "return this.border;";
 
   void set border(String value) native "this.border = value;";
 
   String get code() native "return this.code;";
 
   void set code(String value) native "this.code = value;";
 
   String get codeBase() native "return this.codeBase;";
 
   void set codeBase(String value) native "this.codeBase = value;";
 
   String get codeType() native "return this.codeType;";
 
   void set codeType(String value) native "this.codeType = value;";
 
-  DocumentJs get contentDocument() native "return this.contentDocument;";
+  _DocumentJs get contentDocument() native "return this.contentDocument;";
 
   String get data() native "return this.data;";
 
   void set data(String value) native "this.data = value;";
 
   bool get declare() native "return this.declare;";
 
   void set declare(bool value) native "this.declare = value;";
 
-  HTMLFormElementJs get form() native "return this.form;";
+  _HTMLFormElementJs get form() native "return this.form;";
 
   String get height() native "return this.height;";
 
   void set height(String value) native "this.height = value;";
 
   int get hspace() native "return this.hspace;";
 
   void set hspace(int value) native "this.hspace = value;";
 
   String get name() native "return this.name;";
 
   void set name(String value) native "this.name = value;";
 
   String get standby() native "return this.standby;";
 
   void set standby(String value) native "this.standby = value;";
 
   String get type() native "return this.type;";
 
   void set type(String value) native "this.type = value;";
 
   String get useMap() native "return this.useMap;";
 
   void set useMap(String value) native "this.useMap = value;";
 
   String get validationMessage() native "return this.validationMessage;";
 
-  ValidityStateJs get validity() native "return this.validity;";
+  _ValidityStateJs get validity() native "return this.validity;";
 
   int get vspace() native "return this.vspace;";
 
   void set vspace(int value) native "this.vspace = value;";
 
   String get width() native "return this.width;";
 
   void set width(String value) native "this.width = value;";
 
   bool get willValidate() native "return this.willValidate;";
 
   bool checkValidity() native;
 
-  SVGDocumentJs getSVGDocument() native;
+  _SVGDocumentJs getSVGDocument() native;
 
   void setCustomValidity(String error) native;
 }