Use override in more classes in fpdfsdk/

fpdfsdk/include/javascript/util.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_UTIL_H_
 #define FPDFSDK_INCLUDE_JAVASCRIPT_UTIL_H_
 
 #include <string>  // For std::wstring.
 
 #include "JS_Define.h"
 
 class util : public CJS_EmbedObj {
  public:
   util(CJS_Object* pJSObject);
-  virtual ~util(void);
+  ~util() override;
 
  public:
   FX_BOOL printd(IFXJS_Context* cc,
                  const CJS_Parameters& params,
                  CJS_Value& vRet,
                  CFX_WideString& sError);
   FX_BOOL printf(IFXJS_Context* cc,
                  const CJS_Parameters& params,
                  CJS_Value& vRet,
                  CFX_WideString& sError);
@@ skipping 16 matching lines @@
                      bool bXFAPicture,
                      std::wstring& cPurpose);
   static void printx(const std::string& cFormat,
                      const std::string& cSource,
                      std::string& cPurpose);
   static int ParstDataType(std::wstring* sFormat);
 };
 
 class CJS_Util : public CJS_Object {
  public:
-  CJS_Util(JSFXObject pObject) : CJS_Object(pObject){};
-  virtual ~CJS_Util(void){};
+  CJS_Util(JSFXObject pObject) : CJS_Object(pObject) {}
+  ~CJS_Util() override {}
 
   DECLARE_JS_CLASS(CJS_Util);
 
   JS_STATIC_METHOD(printd, util);
   JS_STATIC_METHOD(printf, util);
   JS_STATIC_METHOD(printx, util);
   JS_STATIC_METHOD(scand, util);
   JS_STATIC_METHOD(byteToChar, util);
 };
 
 int64_t FX_atoi64(const char* nptr);
 
 #endif  // FPDFSDK_INCLUDE_JAVASCRIPT_UTIL_H_