Immediatelly promote marked objects

src/heap/scavenger.h

Index: src/heap/scavenger.h
diff --git a/src/heap/scavenger.h b/src/heap/scavenger.h
index 3db2e5d470f797a759bec2ccca7a40868f4a119c..d9960efa2a2453a318883cfe27215ce05f9f2c00 100644
--- a/src/heap/scavenger.h
+++ b/src/heap/scavenger.h
@@ -26,9 +26,8 @@ class Scavenger {
   // necessary, the object might be promoted to an old space.  The caller must
   // ensure the precondition that the object is (a) a heap object and (b) in
   // the heap's from space.
-  static inline void ScavengeObject(
-      HeapObject** p, HeapObject* object,
-      PromotionMode promotion_mode = DEFAULT_PROMOTION);
+  static inline void ScavengeObject(HeapObject** p, HeapObject* object,
+                                    PromotionMode promotion_mode);
   static inline SlotCallbackResult CheckAndScavengeObject(
       Heap* heap, Address slot_address, PromotionMode promotion_mode);