Use the LookupIterator for SetElement and friends

src/liveedit.h

 // 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.
 
 #ifndef V8_LIVEEDIT_H_
 #define V8_LIVEEDIT_H_
 
 
 
 // Live Edit feature implementation.
@@ skipping 231 matching lines @@
   Handle<JSArray> GetJSArray() {
     return array_;
   }
 
   Isolate* isolate() const {
     return array_->GetIsolate();
   }
 
  protected:
   void SetField(int field_position, Handle<Object> value) {
-    JSObject::SetElement(array_, field_position, value, NONE, SLOPPY).Assert();
+    JSObject::SetElement(array_, field_position, value, SLOPPY).Assert();
   }
 
   void SetSmiValueField(int field_position, int value) {
     SetField(field_position, Handle<Smi>(Smi::FromInt(value), isolate()));
   }
 
   Handle<Object> GetField(int field_position) {
     return Object::GetElement(
         isolate(), array_, field_position).ToHandleChecked();
   }
@@ skipping 99 matching lines @@
   static const int kEndPositionOffset_ = 2;
   static const int kSharedInfoOffset_ = 3;
   static const int kSize_ = 4;
 
   friend class JSArrayBasedStruct<SharedInfoWrapper>;
 };
 
 } }  // namespace v8::internal
 
 #endif /* V*_LIVEEDIT_H_ */