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

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

Index: client/dom/generated/src/frog/FileReader.dart
diff --git a/client/dom/generated/src/frog/FileReader.dart b/client/dom/generated/src/frog/FileReader.dart
index 4839235b11e9f41f0aac70f96a6beaece6be7fa6..c5b85c6d69651813e6f3a99affd8c2f006be3f90 100644
--- a/client/dom/generated/src/frog/FileReader.dart
+++ b/client/dom/generated/src/frog/FileReader.dart
@@ -1,5 +1,5 @@
 
-class FileReaderJs extends DOMTypeJs implements FileReader native "*FileReader" {
+class _FileReaderJs extends _DOMTypeJs implements FileReader native "*FileReader" {
   FileReader() native;
 
 
@@ -9,7 +9,7 @@ class FileReaderJs extends DOMTypeJs implements FileReader native "*FileReader"
 
   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;";
 
@@ -43,15 +43,15 @@ class FileReaderJs extends DOMTypeJs implements FileReader native "*FileReader"
 
   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;
 }