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

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

Index: client/dom/generated/src/frog/IDBDatabase.dart
diff --git a/client/dom/generated/src/frog/IDBDatabase.dart b/client/dom/generated/src/frog/IDBDatabase.dart
index 77421dd515426e106543ef785f70ee3e6b6b7f9d..d93a90cd19afcac1c386c050e4d005e7abe7e3b4 100644
--- a/client/dom/generated/src/frog/IDBDatabase.dart
+++ b/client/dom/generated/src/frog/IDBDatabase.dart
@@ -1,5 +1,5 @@
 
-class IDBDatabaseJs extends DOMTypeJs implements IDBDatabase native "*IDBDatabase" {
+class _IDBDatabaseJs extends _DOMTypeJs implements IDBDatabase native "*IDBDatabase" {
 
   String get name() native "return this.name;";
 
@@ -21,15 +21,15 @@ class IDBDatabaseJs extends DOMTypeJs implements IDBDatabase native "*IDBDatabas
 
   void close() native;
 
-  IDBObjectStoreJs createObjectStore(String name) native;
+  _IDBObjectStoreJs createObjectStore(String name) native;
 
   void deleteObjectStore(String name) native;
 
-  bool dispatchEvent(EventJs evt) native;
+  bool dispatchEvent(_EventJs evt) native;
 
   void removeEventListener(String type, EventListener listener, [bool useCapture = null]) native;
 
-  IDBVersionChangeRequestJs setVersion(String version) native;
+  _IDBVersionChangeRequestJs setVersion(String version) native;
 
-  IDBTransactionJs transaction(String storeName, int mode) native;
+  _IDBTransactionJs transaction(String storeName, int mode) native;
 }