Remove unused CJS_Object::ExitInstance() method

fpdfsdk/javascript/JS_Object.cpp

 // Copyright 2014 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 "fpdfsdk/javascript/JS_Object.h"
 
 #include "fpdfsdk/javascript/JS_Define.h"
 #include "fpdfsdk/javascript/cjs_context.h"
 
 CJS_EmbedObj::CJS_EmbedObj(CJS_Object* pJSObject) : m_pJSObject(pJSObject) {}
 
 CJS_EmbedObj::~CJS_EmbedObj() {
 }
 
 void FreeObject(const v8::WeakCallbackInfo<CJS_Object>& data) {
   CJS_Object* pJSObj = data.GetParameter();
-  pJSObj->ExitInstance();
   delete pJSObj;
   CFXJS_Engine::FreeObjectPrivate(data.GetInternalField(0));
 }
 
 void DisposeObject(const v8::WeakCallbackInfo<CJS_Object>& data) {
   CJS_Object* pJSObj = data.GetParameter();
   pJSObj->Dispose();
   data.SetSecondPassCallback(FreeObject);
 }
 
 CJS_Object::CJS_Object(v8::Local<v8::Object> pObject) {
   m_pIsolate = pObject->GetIsolate();
   m_pV8Object.Reset(m_pIsolate, pObject);
 }
 
 CJS_Object::~CJS_Object() {}
 
 void CJS_Object::MakeWeak() {
   m_pV8Object.SetWeak(this, DisposeObject,
                       v8::WeakCallbackType::kInternalFields);
 }
 
 void CJS_Object::Dispose() {
   m_pV8Object.Reset();
 }
 
 void CJS_Object::InitInstance(IJS_Runtime* pIRuntime) {}
-
-void CJS_Object::ExitInstance() {}