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

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

Index: client/dom/generated/src/frog/IDBRequest.dart
diff --git a/client/dom/generated/src/frog/IDBRequest.dart b/client/dom/generated/src/frog/IDBRequest.dart
index 4e395bef3ef47b51a67474511c18b0ed00896176..33811f541e7ed1d123c20f847267c50c607a7218 100644
--- a/client/dom/generated/src/frog/IDBRequest.dart
+++ b/client/dom/generated/src/frog/IDBRequest.dart
@@ -1,5 +1,5 @@
 
-class IDBRequestJs extends DOMTypeJs implements IDBRequest native "*IDBRequest" {
+class _IDBRequestJs extends _DOMTypeJs implements IDBRequest native "*IDBRequest" {
 
   static final int DONE = 2;
 
@@ -17,17 +17,17 @@ class IDBRequestJs extends DOMTypeJs implements IDBRequest native "*IDBRequest"
 
   int get readyState() native "return this.readyState;";
 
-  IDBAnyJs get result() native "return this.result;";
+  _IDBAnyJs get result() native "return this.result;";
 
-  IDBAnyJs get source() native "return this.source;";
+  _IDBAnyJs get source() native "return this.source;";
 
-  IDBTransactionJs get transaction() native "return this.transaction;";
+  _IDBTransactionJs get transaction() native "return this.transaction;";
 
   String get webkitErrorMessage() native "return this.webkitErrorMessage;";
 
   void addEventListener(String type, EventListener listener, [bool useCapture = null]) native;
 
-  bool dispatchEvent(EventJs evt) native;
+  bool dispatchEvent(_EventJs evt) native;
 
   void removeEventListener(String type, EventListener listener, [bool useCapture = null]) native;
 }