Fix leaked value object in NamedPropertySetterCallback()

fxjs/cfxjse_class.cpp

 // Copyright 2016 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "fxjs/include/cfxjse_class.h"
 
 #include "fxjs/include/cfxjse_context.h"
 #include "fxjs/include/cfxjse_value.h"
@@ skipping 271 matching lines @@
     const v8::PropertyCallbackInfo<v8::Value>& info) {
   v8::Local<v8::Object> thisObject = info.This();
   const FXJSE_CLASS_DESCRIPTOR* lpClass = static_cast<FXJSE_CLASS_DESCRIPTOR*>(
       info.Data().As<v8::External>()->Value());
   v8::String::Utf8Value szPropName(property);
   CFX_ByteStringC szFxPropName(*szPropName, szPropName.length());
   std::unique_ptr<CFXJSE_Value> lpThisValue(
       new CFXJSE_Value(info.GetIsolate()));
   lpThisValue->ForceSetValue(thisObject);
 
-  CFXJSE_Value* lpNewValue = new CFXJSE_Value(info.GetIsolate());
+  std::unique_ptr<CFXJSE_Value> lpNewValue(new CFXJSE_Value(info.GetIsolate()));
   lpNewValue->ForceSetValue(value);
-  DynPropSetterAdapter(lpClass, lpThisValue.get(), szFxPropName, lpNewValue);
+  DynPropSetterAdapter(lpClass, lpThisValue.get(), szFxPropName,
+                       lpNewValue.get());
   info.GetReturnValue().Set(value);
 }
 
 void NamedPropertyEnumeratorCallback(
     const v8::PropertyCallbackInfo<v8::Array>& info) {
   const FXJSE_CLASS_DESCRIPTOR* lpClass = static_cast<FXJSE_CLASS_DESCRIPTOR*>(
       info.Data().As<v8::External>()->Value());
   v8::Isolate* pIsolate = info.GetIsolate();
   v8::Local<v8::Array> newArray = v8::Array::New(pIsolate, lpClass->propNum);
   for (int i = 0; i < lpClass->propNum; i++) {
@@ skipping 119 matching lines @@
       v8::External::New(pIsolate,
                         const_cast<FXJSE_CLASS_DESCRIPTOR*>(lpClassDefinition)),
       v8::PropertyHandlerFlags::kNonMasking);
   hObjectTemplate->SetHandler(configuration);
 }
 
 CFXJSE_Class::CFXJSE_Class(CFXJSE_Context* lpContext)
     : m_lpClassDefinition(nullptr), m_pContext(lpContext) {}
 
 CFXJSE_Class::~CFXJSE_Class() {}