Remove unused CJS_Object::ExitInstance() method

fpdfsdk/javascript/JS_Object.h

 // 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
 
 #ifndef FPDFSDK_JAVASCRIPT_JS_OBJECT_H_
 #define FPDFSDK_JAVASCRIPT_JS_OBJECT_H_
 
 #include <map>
@@ skipping 20 matching lines @@
 
 class CJS_Object {
  public:
   explicit CJS_Object(v8::Local<v8::Object> pObject);
   virtual ~CJS_Object();
 
   void MakeWeak();
   void Dispose();
 
   virtual void InitInstance(IJS_Runtime* pIRuntime);
-  virtual void ExitInstance();
 
   v8::Local<v8::Object> ToV8Object() { return m_pV8Object.Get(m_pIsolate); }
 
   // Takes ownership of |pObj|.
   void SetEmbedObject(CJS_EmbedObj* pObj) { m_pEmbedObj.reset(pObj); }
   CJS_EmbedObj* GetEmbedObject() const { return m_pEmbedObj.get(); }
 
   v8::Isolate* GetIsolate() const { return m_pIsolate; }
 
  protected:
   std::unique_ptr<CJS_EmbedObj> m_pEmbedObj;
   v8::Global<v8::Object> m_pV8Object;
   v8::Isolate* m_pIsolate;
 };
 
 
 #endif  // FPDFSDK_JAVASCRIPT_JS_OBJECT_H_