Use override in more classes in fpdfsdk/

fpdfsdk/include/javascript/event.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_EVENT_H_
 #define FPDFSDK_INCLUDE_JAVASCRIPT_EVENT_H_
 
 #include "JS_Define.h"
 
 class event : public CJS_EmbedObj {
  public:
   event(CJS_Object* pJSObject);
-  virtual ~event(void);
+  ~event() override;
 
  public:
   FX_BOOL change(IFXJS_Context* cc, CJS_PropValue& vp, CFX_WideString& sError);
   FX_BOOL changeEx(IFXJS_Context* cc,
                    CJS_PropValue& vp,
                    CFX_WideString& sError);
   FX_BOOL commitKey(IFXJS_Context* cc,
                     CJS_PropValue& vp,
                     CFX_WideString& sError);
   FX_BOOL fieldFull(IFXJS_Context* cc,
@@ skipping 26 matching lines @@
                      CFX_WideString& sError);
   FX_BOOL type(IFXJS_Context* cc, CJS_PropValue& vp, CFX_WideString& sError);
   FX_BOOL value(IFXJS_Context* cc, CJS_PropValue& vp, CFX_WideString& sError);
   FX_BOOL willCommit(IFXJS_Context* cc,
                      CJS_PropValue& vp,
                      CFX_WideString& sError);
 };
 
 class CJS_Event : public CJS_Object {
  public:
-  CJS_Event(JSFXObject pObject) : CJS_Object(pObject){};
-  virtual ~CJS_Event(void){};
+  CJS_Event(JSFXObject pObject) : CJS_Object(pObject) {}
+  ~CJS_Event() override {}
 
   DECLARE_JS_CLASS(CJS_Event);
 
   JS_STATIC_PROP(change, event);
   JS_STATIC_PROP(changeEx, event);
   JS_STATIC_PROP(commitKey, event);
   JS_STATIC_PROP(fieldFull, event);
   JS_STATIC_PROP(keyDown, event);
   JS_STATIC_PROP(modifier, event);
   JS_STATIC_PROP(name, event);
   JS_STATIC_PROP(rc, event);
   JS_STATIC_PROP(richChange, event);
   JS_STATIC_PROP(richChangeEx, event);
   JS_STATIC_PROP(richValue, event);
   JS_STATIC_PROP(selEnd, event);
   JS_STATIC_PROP(selStart, event);
   JS_STATIC_PROP(shift, event);
   JS_STATIC_PROP(source, event);
   JS_STATIC_PROP(target, event);
   JS_STATIC_PROP(targetName, event);
   JS_STATIC_PROP(type, event);
   JS_STATIC_PROP(value, event);
   JS_STATIC_PROP(willCommit, event);
 };
 
 #endif  // FPDFSDK_INCLUDE_JAVASCRIPT_EVENT_H_