Clean up the public interface of Map.

test/cctest/test-heap.cc

Index: test/cctest/test-heap.cc
diff --git a/test/cctest/test-heap.cc b/test/cctest/test-heap.cc
index 83a95f786cafd269c41dba118c23526138ad6fdf..0741294401e51df6448bf8b193339b878c00b481 100644
--- a/test/cctest/test-heap.cc
+++ b/test/cctest/test-heap.cc
@@ -2072,10 +2072,6 @@ TEST(PrototypeTransitionClearing) {
   CHECK(!space->LastPage()->Contains(
       map->GetPrototypeTransitions()->address()));
   CHECK(space->LastPage()->Contains(prototype->address()));
-  JSObject::SetPrototype(baseObject, prototype, false);
-  CHECK(Map::GetPrototypeTransition(map, prototype)->IsMap());
-  CcTest::heap()->CollectAllGarbage(Heap::kNoGCFlags);
-  CHECK(Map::GetPrototypeTransition(map, prototype)->IsMap());
 }