Get rid of NULLs in fpdfsdk/

fpdfsdk/javascript/JS_Object.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 "fpdfsdk/javascript/JS_Object.h"
 
 #include "fpdfsdk/include/fsdk_mgr.h"
 #include "fpdfsdk/javascript/JS_Define.h"
@@ skipping 13 matching lines @@
     pDoc->KillFocusAnnot();
 
   return pApp->JS_appAlert(swMsg, swTitle, nType, nIcon);
 }
 
 }  // namespace
 
 CJS_EmbedObj::CJS_EmbedObj(CJS_Object* pJSObject) : m_pJSObject(pJSObject) {}
 
 CJS_EmbedObj::~CJS_EmbedObj() {
-  m_pJSObject = NULL;
+  m_pJSObject = nullptr;
 }
 
 int CJS_EmbedObj::MsgBox(CPDFDoc_Environment* pApp,
                          const FX_WCHAR* swMsg,
                          const FX_WCHAR* swTitle,
                          FX_UINT nType,
                          FX_UINT nIcon) {
   return FXJS_MsgBox(pApp, swMsg, swTitle, nType, nIcon);
 }
 
@@ skipping 35 matching lines @@
                        const FX_WCHAR* swTitle,
                        FX_UINT nType,
                        FX_UINT nIcon) {
   return FXJS_MsgBox(pApp, swMsg, swTitle, nType, nIcon);
 }
 
 void CJS_Object::Alert(CJS_Context* pContext, const FX_WCHAR* swMsg) {
   if (pContext->IsMsgBoxEnabled()) {
     CPDFDoc_Environment* pApp = pContext->GetReaderApp();
     if (pApp)
-      pApp->JS_appAlert(swMsg, NULL, 0, 3);
+      pApp->JS_appAlert(swMsg, nullptr, 0, 3);
   }
 }
 
 CJS_Timer::CJS_Timer(CJS_EmbedObj* pObj,
                      CPDFDoc_Environment* pApp,
                      CJS_Runtime* pRuntime,
                      int nType,
                      const CFX_WideString& script,
                      uint32_t dwElapse,
                      uint32_t dwTimeOut)
@@ skipping 47 matching lines @@
 // static
 CJS_Timer::TimerMap* CJS_Timer::GetGlobalTimerMap() {
   // Leak the timer array at shutdown.
   static auto* s_TimerMap = new TimerMap;
   return s_TimerMap;
 }
 
 void CJS_Timer::OnDestroyed() {
   m_bValid = false;
 }