[heap] No leakage of objects-visiting.h outside of heap.

src/heap/mark-compact.h

Index: src/heap/mark-compact.h
diff --git a/src/heap/mark-compact.h b/src/heap/mark-compact.h
index f6df6f4a2e5394b30b22fdef668789ed50f73d19..7c438132b4b7657d3ee80a55004e680d3a8fb45b 100644
--- a/src/heap/mark-compact.h
+++ b/src/heap/mark-compact.h
@@ -117,10 +117,6 @@ class Marking : public AllStatic {
     markbit.Next().Set();
   }
 
-  static void SetAllMarkBitsInRange(MarkBit start, MarkBit end);
-  static void ClearAllMarkBitsOfCellsContainedInRange(MarkBit start,
-                                                      MarkBit end);
-
   static void TransferMark(Heap* heap, Address old_start, Address new_start);
 
 #ifdef DEBUG