[regexp] Remove unused code

src/code-factory.h

Index: src/code-factory.h
diff --git a/src/code-factory.h b/src/code-factory.h
index 6be78aea852db74d3605d9368d72f2a274b278b2..b26cbaf79bd241dd7be53630c9fe451645d6383c 100644
--- a/src/code-factory.h
+++ b/src/code-factory.h
@@ -83,7 +83,6 @@ class V8_EXPORT_PRIVATE CodeFactory final {
                                       OrdinaryToPrimitiveHint hint);
   static Callable NumberToString(Isolate* isolate);
 
-  static Callable RegExpConstructResult(Isolate* isolate);
   static Callable RegExpExec(Isolate* isolate);
 
   static Callable Add(Isolate* isolate);