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

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

 
-class FileReaderJs extends DOMTypeJs implements FileReader native "*FileReader" {
+class _FileReaderJs extends _DOMTypeJs implements FileReader native "*FileReader" {
   FileReader() native;
 
 
   static final int DONE = 2;
 
   static final int EMPTY = 0;
 
   static final int LOADING = 1;
 
-  FileErrorJs get error() native "return this.error;";
+  _FileErrorJs get error() native "return this.error;";
 
   EventListener get onabort() native "return this.onabort;";
 
   void set onabort(EventListener value) native "this.onabort = value;";
 
   EventListener get onerror() native "return this.onerror;";
 
   void set onerror(EventListener value) native "this.onerror = value;";
 
   EventListener get onload() native "return this.onload;";
@@ skipping 13 matching lines @@
   void set onprogress(EventListener value) native "this.onprogress = value;";
 
   int get readyState() native "return this.readyState;";
 
   Object get result() native "return this.result;";
 
   void abort() native;
 
   void addEventListener(String type, EventListener listener, [bool useCapture = null]) native;
 
-  bool dispatchEvent(EventJs evt) native;
+  bool dispatchEvent(_EventJs evt) native;
 
-  void readAsArrayBuffer(BlobJs blob) native;
+  void readAsArrayBuffer(_BlobJs blob) native;
 
-  void readAsBinaryString(BlobJs blob) native;
+  void readAsBinaryString(_BlobJs blob) native;
 
-  void readAsDataURL(BlobJs blob) native;
+  void readAsDataURL(_BlobJs blob) native;
 
-  void readAsText(BlobJs blob, [String encoding = null]) native;
+  void readAsText(_BlobJs blob, [String encoding = null]) native;
 
   void removeEventListener(String type, EventListener listener, [bool useCapture = null]) native;
 }