start working on better scope handling

Author: rbri

src/main/java/org/htmlunit/javascript/JavaScriptEngine.java

@@ -210,7 +210,7 @@ private void init(final WebWindow webWindow, final Page page, final Context cont
         final Window jsWindowScope = new Window();
         jsWindowScope.setClassName("Window");
 
-        context.initSafeStandardObjects(jsWindowScope);
+        final Scriptable scope = context.initSafeStandardObjects(jsWindowScope);
         configureRhino(webClient, browserVersion, jsWindowScope);
 
         final Map<Class<? extends Scriptable>, Scriptable> prototypes = new HashMap<>();

src/main/java/org/htmlunit/javascript/host/worker/DedicatedWorkerGlobalScope.java

@@ -125,7 +125,7 @@ public void jsConstructor() {
 
         final BrowserVersion browserVersion = webClient.getBrowserVersion();
 
-        context.initSafeStandardObjects(this);
+        final Scriptable scope = context.initSafeStandardObjects(this);
         JavaScriptEngine.configureRhino(webClient, browserVersion, this);
 
         final WorkerJavaScriptConfiguration jsConfig = WorkerJavaScriptConfiguration.getInstance(browserVersion);