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

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

 
-class XMLHttpRequestJs extends DOMTypeJs implements XMLHttpRequest native "*XMLHttpRequest" {
+class _XMLHttpRequestJs extends _DOMTypeJs implements XMLHttpRequest native "*XMLHttpRequest" {
   XMLHttpRequest() native;
 
 
   static final int DONE = 4;
 
   static final int HEADERS_RECEIVED = 2;
 
   static final int LOADING = 3;
 
   static final int OPENED = 1;
 
   static final int UNSENT = 0;
 
   bool get asBlob() native "return this.asBlob;";
 
   void set asBlob(bool value) native "this.asBlob = value;";
 
   int get readyState() native "return this.readyState;";
 
   Object get response() native "return this.response;";
 
-  BlobJs get responseBlob() native "return this.responseBlob;";
+  _BlobJs get responseBlob() native "return this.responseBlob;";
 
   String get responseText() native "return this.responseText;";
 
   String get responseType() native "return this.responseType;";
 
   void set responseType(String value) native "this.responseType = value;";
 
-  DocumentJs get responseXML() native "return this.responseXML;";
+  _DocumentJs get responseXML() native "return this.responseXML;";
 
   int get status() native "return this.status;";
 
   String get statusText() native "return this.statusText;";
 
-  XMLHttpRequestUploadJs get upload() native "return this.upload;";
+  _XMLHttpRequestUploadJs get upload() native "return this.upload;";
 
   bool get withCredentials() native "return this.withCredentials;";
 
   void set withCredentials(bool value) native "this.withCredentials = value;";
 
   void abort() native;
 
   void addEventListener(String type, EventListener listener, [bool useCapture = null]) native;
 
-  bool dispatchEvent(EventJs evt) native;
+  bool dispatchEvent(_EventJs evt) native;
 
   String getAllResponseHeaders() native;
 
   String getResponseHeader(String header) native;
 
   void open(String method, String url, [bool async = null, String user = null, String password = null]) native;
 
   void overrideMimeType(String override) native;
 
   void removeEventListener(String type, EventListener listener, [bool useCapture = null]) native;
 
   void send([var data = null]) native;
 
   void setRequestHeader(String header, String value) native;
 }