JS: Remove unused predicate

Author: asgerf

javascript/ql/lib/semmle/javascript/ApiGraphs.qll

@@ -778,17 +778,6 @@ module API {
       } or
       MkSyntheticCallbackArg(DataFlow::InvokeNode nd)
 
-    private predicate needsDefNode(DataFlow::ClassNode cls) {
-      hasSemantics(cls) and
-      (
-        cls = trackDefNode(_)
-        or
-        cls.getAnInstanceReference() = trackDefNode(_)
-        or
-        needsDefNode(cls.getADirectSubClass())
-      )
-    }
-
     class TDef = MkModuleDef or TNonModuleDef;
 
     class TNonModuleDef = MkModuleExport or MkClassInstance or MkDef or MkSyntheticCallbackArg;