Get rid of NULLs in fpdfsdk/

fpdfsdk/javascript/cjs_runtime.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/cjs_runtime.h"
 
 #include <algorithm>
 
@@ skipping 34 matching lines @@
 }
 
 // static
 CJS_Runtime* CJS_Runtime::FromContext(const IJS_Context* cc) {
   const CJS_Context* pContext = static_cast<const CJS_Context*>(cc);
   return pContext->GetJSRuntime();
 }
 
 CJS_Runtime::CJS_Runtime(CPDFDoc_Environment* pApp)
     : m_pApp(pApp),
-      m_pDocument(NULL),
+      m_pDocument(nullptr),
       m_bBlocking(FALSE),
-      m_isolate(NULL),
+      m_isolate(nullptr),
       m_isolateManaged(false) {
 #ifndef PDF_ENABLE_XFA
   IPDF_JSPLATFORM* pPlatform = m_pApp->GetFormFillInfo()->m_pJsPlatform;
   if (pPlatform->version <= 2) {
     unsigned int embedderDataSlot = 0;
     v8::Isolate* pExternalIsolate = nullptr;
     if (pPlatform->version == 2) {
       pExternalIsolate = reinterpret_cast<v8::Isolate*>(pPlatform->m_isolate);
       embedderDataSlot = pPlatform->m_v8EmbedderSlot;
 #else
@@ skipping 247 matching lines @@
 #endif
 void CJS_Runtime::AddObserver(Observer* observer) {
   ASSERT(!pdfium::ContainsKey(m_observers, observer));
   m_observers.insert(observer);
 }
 
 void CJS_Runtime::RemoveObserver(Observer* observer) {
   ASSERT(pdfium::ContainsKey(m_observers, observer));
   m_observers.erase(observer);
 }