Make code compile with clang_use_chrome_plugin (part IV)

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 28 matching lines @@
 };
 
 class CJS_Object {
  public:
   explicit CJS_Object(v8::Local<v8::Object> pObject);
   virtual ~CJS_Object();
 
   void MakeWeak();
   void Dispose();
 
-  virtual FX_BOOL IsType(const FX_CHAR* sClassName) { return TRUE; }
-  virtual CFX_ByteString GetClassName() { return ""; }
+  virtual FX_BOOL IsType(const FX_CHAR* sClassName);
+  virtual CFX_ByteString GetClassName();
 
-  virtual void InitInstance(IJS_Runtime* pIRuntime) {}
-  virtual void ExitInstance() {}
+  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(); }
 
   static int MsgBox(CPDFDoc_Environment* pApp,
                     const FX_WCHAR* swMsg,
                     const FX_WCHAR* swTitle,
@@ skipping 43 matching lines @@
 
   // data
   const int m_nType;  // 0:Interval; 1:TimeOut
   const uint32_t m_dwTimeOut;
   const CFX_WideString m_swJScript;
   CJS_Runtime* const m_pRuntime;
   CPDFDoc_Environment* const m_pApp;
 };
 
 #endif  // FPDFSDK_JAVASCRIPT_JS_OBJECT_H_