Use override in more classes in fpdfsdk/

fpdfsdk/include/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_INCLUDE_JAVASCRIPT_JS_OBJECT_H_
 #define FPDFSDK_INCLUDE_JAVASCRIPT_JS_OBJECT_H_
 
 #include <map>
@@ skipping 31 matching lines @@
              FX_UINT nIcon = 0);
   void Alert(CJS_Context* pContext, const FX_WCHAR* swMsg);
 
  protected:
   CJS_Object* m_pJSObject;
 };
 
 class CJS_Object {
  public:
   explicit CJS_Object(JSFXObject pObject);
-  virtual ~CJS_Object(void);
+  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 InitInstance(IFXJS_Context* cc) { return TRUE; }
   virtual FX_BOOL ExitInstance() { return TRUE; }
 
@@ skipping 71 matching lines @@
   FX_DWORD m_dwTimeOut;
   FX_DWORD m_dwElapse;
   CJS_Runtime* m_pRuntime;
   CFX_WideString m_swJScript;
   int m_nType;  // 0:Interval; 1:TimeOut
 
   CPDFDoc_Environment* m_pApp;
 };
 
 #endif  // FPDFSDK_INCLUDE_JAVASCRIPT_JS_OBJECT_H_