Backout ac48416672e7 for unexpected SM(r) failures.

Even if the there is a CLOSED TREE by the time I push.

js/public/RootingAPI.h

@@ -628,9 +628,6 @@ class MOZ_STACK_CLASS Rooted : public js::RootedBase<T>
 
   private:
     void commonInit(Rooted<void*> **thingGCRooters) {
-#if defined(DEBUG) && defined(JS_GC_ZEAL) && defined(JSGC_ROOT_ANALYSIS) && !defined(JS_THREADSAFE)
-        scanned = false;
-#endif
 #if defined(JSGC_ROOT_ANALYSIS) || defined(JSGC_USE_EXACT_ROOTING)
         js::ThingRootKind kind = js::GCMethods<T>::kind();
         this->stack = &thingGCRooters[kind];