ES6: Implement WeakSet

src/incremental-marking.cc

Index: src/incremental-marking.cc
diff --git a/src/incremental-marking.cc b/src/incremental-marking.cc
index 17e79fde89db7c366876707f1f227d0e9a2b40f0..df0f14a74cef8363e51c98bd3bdc8d2e60b44309 100644
--- a/src/incremental-marking.cc
+++ b/src/incremental-marking.cc
@@ -273,11 +273,12 @@ class IncrementalMarkingMarkingVisitor
     VisitNativeContext(map, context);
   }
 
-  static void VisitJSWeakMap(Map* map, HeapObject* object) {
+  static void VisitWeakCollection(Map* map, HeapObject* object) {
     Heap* heap = map->GetHeap();
     VisitPointers(heap,
-                  HeapObject::RawField(object, JSWeakMap::kPropertiesOffset),
-                  HeapObject::RawField(object, JSWeakMap::kSize));
+                  HeapObject::RawField(object,
+                                       JSWeakCollection::kPropertiesOffset),
+                  HeapObject::RawField(object, JSWeakCollection::kSize));
   }
 
   static void BeforeVisitingSharedFunctionInfo(HeapObject* object) {}