Get rid of NULLs in core/

core/fxcrt/fx_basic_list.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 "core/fxcrt/include/fx_basic.h"
 #include "core/fxcrt/plex.h"
 
 CFX_PtrList::CFX_PtrList(int nBlockSize)
-    : m_pNodeHead(NULL),
-      m_pNodeTail(NULL),
+    : m_pNodeHead(nullptr),
+      m_pNodeTail(nullptr),
       m_nCount(0),
-      m_pNodeFree(NULL),
-      m_pBlocks(NULL),
+      m_pNodeFree(nullptr),
+      m_pBlocks(nullptr),
       m_nBlockSize(nBlockSize) {}
 FX_POSITION CFX_PtrList::AddTail(void* newElement) {
-  CNode* pNewNode = NewNode(m_pNodeTail, NULL);
+  CNode* pNewNode = NewNode(m_pNodeTail, nullptr);
   pNewNode->data = newElement;
   if (m_pNodeTail) {
     m_pNodeTail->pNext = pNewNode;
   } else {
     m_pNodeHead = pNewNode;
   }
   m_pNodeTail = pNewNode;
   return (FX_POSITION)pNewNode;
 }
 FX_POSITION CFX_PtrList::AddHead(void* newElement) {
-  CNode* pNewNode = NewNode(NULL, m_pNodeHead);
+  CNode* pNewNode = NewNode(nullptr, m_pNodeHead);
   pNewNode->data = newElement;
   if (m_pNodeHead) {
     m_pNodeHead->pPrev = pNewNode;
   } else {
     m_pNodeTail = pNewNode;
   }
   m_pNodeHead = pNewNode;
   return (FX_POSITION)pNewNode;
 }
 FX_POSITION CFX_PtrList::InsertAfter(FX_POSITION position, void* newElement) {
@@ skipping 65 matching lines @@
   ASSERT(m_nCount > 0);
   pNode->data = 0;
   return pNode;
 }
 CFX_PtrList::~CFX_PtrList() {
   RemoveAll();
   ASSERT(m_nCount == 0);
 }
 FX_POSITION CFX_PtrList::FindIndex(int nIndex) const {
   if (nIndex >= m_nCount || nIndex < 0) {
-    return NULL;
+    return nullptr;
   }
   CNode* pNode = m_pNodeHead;
   while (nIndex--) {
     pNode = pNode->pNext;
   }
   return (FX_POSITION)pNode;
 }
 FX_POSITION CFX_PtrList::Find(void* searchValue, FX_POSITION startAfter) const {
   CNode* pNode = (CNode*)startAfter;
   pNode = pNode ? pNode->pNext : m_pNodeHead;
   for (; pNode; pNode = pNode->pNext) {
     if (pNode->data == searchValue)
       return (FX_POSITION)pNode;
   }
-  return NULL;
+  return nullptr;
 }