Use override in more classes in fpdfsdk/

fpdfsdk/src/javascript/global.cpp

 // 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
 
 #include "../../include/javascript/IJavaScript.h"
 #include "../../include/javascript/JS_Context.h"
 #include "../../include/javascript/JS_Define.h"
 #include "../../include/javascript/JS_EventHandler.h"
@@ skipping 88 matching lines @@
   ASSERT(pGlobal != NULL);
 
   pGlobal->Initial(pContext->GetReaderApp());
 
   return TRUE;
 };
 
 global_alternate::global_alternate(CJS_Object* pJSObject)
     : CJS_EmbedObj(pJSObject), m_pApp(NULL) {}
 
-global_alternate::~global_alternate(void) {
+global_alternate::~global_alternate() {
   DestroyGlobalPersisitentVariables();
   m_pApp->GetRuntimeFactory()->ReleaseGlobalData();
 }
 
 void global_alternate::Initial(CPDFDoc_Environment* pApp) {
   m_pApp = pApp;
   m_pGlobalData = pApp->GetRuntimeFactory()->NewGlobalData(pApp);
   UpdateGlobalPersistentVariables();
 }
 
@@ skipping 438 matching lines @@
     return VT_boolean;
   if (nHash == JSCONST_nDateHash)
     return VT_date;
   if (nHash == JSCONST_nObjectHash)
     return VT_object;
   if (nHash == JSCONST_nFXobjHash)
     return VT_fxobject;
 
   return VT_unknown;
 }