Oilpan: Remove a visitor parameter from isHeapObjectAlive

Source/wtf/HashTable.h

Index: Source/wtf/HashTable.h
diff --git a/Source/wtf/HashTable.h b/Source/wtf/HashTable.h
index 1e29a606e0508565f3e92587272997452f9c2f65..4ff96014cf1d371edd70792beb761dd3dafdaa42 100644
--- a/Source/wtf/HashTable.h
+++ b/Source/wtf/HashTable.h
@@ -1289,7 +1289,7 @@ template<typename Key, typename Value, typename Extractor, typename HashFunction
         // and/or weak callback then we are done. This optimization does not
         // happen for ListHashSet since its iterator does not point at the
         // backing.
-        if (!m_table || visitor->isHeapObjectAlive(m_table))
+        if (!m_table || Allocator::isHeapObjectAlive(m_table))
             return;
         // Normally, we mark the backing store without performing trace. This
         // means it is marked live, but the pointers inside it are not marked.