Revert of [proxies] Better print for proxies in d8

src/js/object-observe.js

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 (function(global, utils) {
 
 "use strict";
 
 %CheckIsBootstrapping();
 
@@ skipping 174 matching lines @@
 
 function ObserverIsActive(observer, objectInfo) {
   return TypeMapIsDisjointFrom(ObjectInfoGetPerformingTypes(objectInfo),
                                ObserverGetAcceptTypes(observer));
 }
 
 
 function ObjectInfoGetOrCreate(object) {
   var objectInfo = ObjectInfoGet(object);
   if (IS_UNDEFINED(objectInfo)) {
-    if (!IS_PROXY(object)) {
+    if (!%_IsJSProxy(object)) {
       %SetIsObserved(object);
     }
     objectInfo = {
       object: object,
       changeObservers: null,
       notifier: null,
       performing: null,
       performingCount: 0,
     };
     %WeakCollectionSet(GetObservationStateJS().objectInfoMap,
@@ skipping 506 matching lines @@
 
 utils.Export(function(to) {
   to.ObserveArrayMethods = ObserveArrayMethods;
   to.ObserveBeginPerformSplice = BeginPerformSplice;
   to.ObserveEndPerformSplice = EndPerformSplice;
   to.ObserveEnqueueSpliceRecord = EnqueueSpliceRecord;
   to.ObserveObjectMethods = ObserveObjectMethods;
 });
 
 })