[heap] Make MarkInlinedFunctionsCode visitor private.

src/heap/objects-visiting.h

Index: src/heap/objects-visiting.h
diff --git a/src/heap/objects-visiting.h b/src/heap/objects-visiting.h
index 95cc80753a9daef391ec8d36211a13e81d751240..172ab953891822acadc2886f712a204c42bee89e 100644
--- a/src/heap/objects-visiting.h
+++ b/src/heap/objects-visiting.h
@@ -370,10 +370,6 @@ class StaticMarkingVisitor : public StaticVisitorBase {
   // Skip the weak next code link in a code object.
   INLINE(static void VisitNextCodeLink(Heap* heap, Object** slot)) {}
 
-  // Mark non-optimize code for functions inlined into the given optimized
-  // code. This will prevent it from being flushed.
-  static void MarkInlinedFunctionsCode(Heap* heap, Code* code);
-
  protected:
   INLINE(static void VisitMap(Map* map, HeapObject* object));
   INLINE(static void VisitCode(Map* map, HeapObject* object));
@@ -397,6 +393,10 @@ class StaticMarkingVisitor : public StaticVisitorBase {
   // references, possibly treating some entries weak.
   static void MarkOptimizedCodeMap(Heap* heap, FixedArray* code_map);
 
+  // Mark non-optimized code for functions inlined into the given optimized
+  // code. This will prevent it from being flushed.
+  static void MarkInlinedFunctionsCode(Heap* heap, Code* code);
+
   // Code flushing support.
   INLINE(static bool IsFlushable(Heap* heap, JSFunction* function));
   INLINE(static bool IsFlushable(Heap* heap, SharedFunctionInfo* shared_info));