[heap] Untangle Marking and friends from heap dependencies.

src/heap/objects-visiting-inl.h

Index: src/heap/objects-visiting-inl.h
diff --git a/src/heap/objects-visiting-inl.h b/src/heap/objects-visiting-inl.h
index 6d26ad00b0b9805c4e7881d3800df2e2193c5423..148975f630058363f781319f4775eb01368bef14 100644
--- a/src/heap/objects-visiting-inl.h
+++ b/src/heap/objects-visiting-inl.h
@@ -570,7 +570,7 @@ bool StaticMarkingVisitor<StaticVisitor>::IsFlushable(Heap* heap,
 
   // Code is either on stack, in compilation cache or referenced
   // by optimized version of function.
-  MarkBit code_mark = Marking::MarkBitFrom(function->code());
+  MarkBit code_mark = ObjectMarking::MarkBitFrom(function->code());
   if (Marking::IsBlackOrGrey(code_mark)) {
     return false;
   }
@@ -594,7 +594,7 @@ bool StaticMarkingVisitor<StaticVisitor>::IsFlushable(
     Heap* heap, SharedFunctionInfo* shared_info) {
   // Code is either on stack, in compilation cache or referenced
   // by optimized version of function.
-  MarkBit code_mark = Marking::MarkBitFrom(shared_info->code());
+  MarkBit code_mark = ObjectMarking::MarkBitFrom(shared_info->code());
   if (Marking::IsBlackOrGrey(code_mark)) {
     return false;
   }