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

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

 
-class InjectedScriptHostJs extends DOMTypeJs implements InjectedScriptHost native "*InjectedScriptHost" {
+class _InjectedScriptHostJs extends _DOMTypeJs implements InjectedScriptHost native "*InjectedScriptHost" {
 
   void clearConsoleMessages() native;
 
   void copyText(String text) native;
 
   int databaseId(Object database) native;
 
   void didCreateWorker(int id, String url, bool isFakeWorker) native;
 
   void didDestroyWorker(int id) native;
 
   Object evaluate(String text) native;
 
   Object functionDetails(Object object) native;
 
   void inspect(Object objectId, Object hints) native;
 
   Object inspectedNode(int num) native;
 
   Object internalConstructorName(Object object) native;
 
   bool isHTMLAllCollection(Object object) native;
 
   int nextWorkerId() native;
 
   int storageId(Object storage) native;
 
   String type(Object object) native;
 }