Remove extension group from DOMWrapperWorld.

third_party/WebKit/Source/bindings/core/v8/ScriptController.h

Index: third_party/WebKit/Source/bindings/core/v8/ScriptController.h
diff --git a/third_party/WebKit/Source/bindings/core/v8/ScriptController.h b/third_party/WebKit/Source/bindings/core/v8/ScriptController.h
index 747bea01e12b952305134034d9bd0c4f8714bba2..9b1e5a015e8d5a4f0d5b2b4d86ff37316085b293 100644
--- a/third_party/WebKit/Source/bindings/core/v8/ScriptController.h
+++ b/third_party/WebKit/Source/bindings/core/v8/ScriptController.h
@@ -108,11 +108,9 @@ class CORE_EXPORT ScriptController final
   // If an isolated world with the specified ID already exists, it is reused.
   // Otherwise, a new world is created.
   //
-  // FIXME: Get rid of extensionGroup here.
   // FIXME: We don't want to support multiple scripts.
   void executeScriptInIsolatedWorld(int worldID,
                                     const HeapVector<ScriptSourceCode>& sources,
-                                    int extensionGroup,
                                     Vector<v8::Local<v8::Value>>* results);
 
   // Returns true if argument is a JavaScript URL.