Remove extension group from DOMWrapperWorld.

content/renderer/dom_automation_controller.cc

Index: content/renderer/dom_automation_controller.cc
diff --git a/content/renderer/dom_automation_controller.cc b/content/renderer/dom_automation_controller.cc
index 75189146f884b4a1cd43e6c1335f1fb8eb0750f4..b8253de1b9b2dbc621a751ec7be56f8829d6cb93 100644
--- a/content/renderer/dom_automation_controller.cc
+++ b/content/renderer/dom_automation_controller.cc
@@ -60,7 +60,6 @@ void DomAutomationController::OnDestruct() {}
 
 void DomAutomationController::DidCreateScriptContext(
     v8::Local<v8::Context> context,
-    int extension_group,
     int world_id) {
   // Add the domAutomationController to isolated worlds as well.
   v8::Isolate* isolate = blink::mainThreadIsolate();