Oilpan: Remove a visitor parameter from isHeapObjectAlive

Source/platform/heap/Handle.h

Index: Source/platform/heap/Handle.h
diff --git a/Source/platform/heap/Handle.h b/Source/platform/heap/Handle.h
index b0821457146f85dc60f2e6e39c90523a7b36c295..28b9d5a4422d977fedbdeb7608eca5a37ee04220 100644
--- a/Source/platform/heap/Handle.h
+++ b/Source/platform/heap/Handle.h
@@ -1083,7 +1083,7 @@ template<typename T> struct HashTraits<blink::WeakMember<T>> : SimpleClassHashTr
             visitor->trace(weakMember.get()); // Strongified visit.
             return false;
         }
-        return !visitor->isHeapObjectAlive(weakMember);
+        return !blink::Heap::isHeapObjectAlive(weakMember);
     }
 };