[proxies] Make Object.prototype.isPrototypeOf work with proxies.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index d630c522c085619a919144d87fe55803890d5f3b..396eb7cf6973a64423adb395e1ad53f6684c17ea 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1305,7 +1305,9 @@ class Object {
   static inline MaybeHandle<Object> GetPrototype(Isolate* isolate,
                                                  Handle<Object> receiver);
 
-  bool HasInPrototypeChain(Isolate* isolate, Object* object);
+  MUST_USE_RESULT static Maybe<bool> HasInPrototypeChain(Isolate* isolate,
+                                                         Handle<Object> object,
+                                                         Handle<Object> proto);
 
   // Returns the permanent hash code associated with this object. May return
   // undefined if not yet created.