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

src/runtime/runtime-object.cc

Index: src/runtime/runtime-object.cc
diff --git a/src/runtime/runtime-object.cc b/src/runtime/runtime-object.cc
index ad69a1004bf27bb847b8ce5c6fe46427390d690d..57191a8fc31d03cfdc88927d42521c06fe540182 100644
--- a/src/runtime/runtime-object.cc
+++ b/src/runtime/runtime-object.cc
@@ -1538,18 +1538,20 @@ RUNTIME_FUNCTION(Runtime_InstanceOf) {
         NewTypeError(MessageTemplate::kInstanceofNonobjectProto, prototype));
   }
   // Return whether or not {prototype} is in the prototype chain of {object}.
-  return isolate->heap()->ToBoolean(
-      object->HasInPrototypeChain(isolate, *prototype));
+  Maybe<bool> result = Object::HasInPrototypeChain(isolate, object, prototype);
+  MAYBE_RETURN(result, isolate->heap()->exception());
+  return isolate->heap()->ToBoolean(result.FromJust());
 }
 
 
 RUNTIME_FUNCTION(Runtime_HasInPrototypeChain) {
-  SealHandleScope scope(isolate);
+  HandleScope scope(isolate);
   DCHECK_EQ(2, args.length());
-  CONVERT_ARG_CHECKED(Object, object, 0);
-  CONVERT_ARG_CHECKED(Object, prototype, 1);
-  return isolate->heap()->ToBoolean(
-      object->HasInPrototypeChain(isolate, prototype));
+  CONVERT_ARG_HANDLE_CHECKED(Object, object, 0);
+  CONVERT_ARG_HANDLE_CHECKED(Object, prototype, 1);
+  Maybe<bool> result = Object::HasInPrototypeChain(isolate, object, prototype);
+  MAYBE_RETURN(result, isolate->heap()->exception());
+  return isolate->heap()->ToBoolean(result.FromJust());
 }