Get rid of NULLs in core/

core/fpdfapi/fpdf_parser/cpdf_array.cpp

 // Copyright 2016 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/fpdfapi/fpdf_parser/include/cpdf_array.h"
 
 #include "core/fpdfapi/fpdf_parser/include/cpdf_name.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_number.h"
@@ skipping 83 matching lines @@
 
 FX_FLOAT CPDF_Array::GetNumberAt(size_t i) const {
   if (i >= m_Objects.size())
     return 0;
   return m_Objects.at(i)->GetNumber();
 }
 
 CPDF_Dictionary* CPDF_Array::GetDictAt(size_t i) const {
   CPDF_Object* p = GetDirectObjectAt(i);
   if (!p)
-    return NULL;
+    return nullptr;
   if (CPDF_Dictionary* pDict = p->AsDictionary())
     return pDict;
   if (CPDF_Stream* pStream = p->AsStream())
     return pStream->GetDict();
-  return NULL;
+  return nullptr;
 }
 
 CPDF_Stream* CPDF_Array::GetStreamAt(size_t i) const {
   return ToStream(GetDirectObjectAt(i));
 }
 
 CPDF_Array* CPDF_Array::GetArrayAt(size_t i) const {
   return ToArray(GetDirectObjectAt(i));
 }
 
@@ skipping 71 matching lines @@
   ASSERT(IsArray());
   CPDF_Number* pNumber = new CPDF_Number(f);
   Add(pNumber);
 }
 
 void CPDF_Array::AddReference(CPDF_IndirectObjectHolder* pDoc,
                               uint32_t objnum) {
   ASSERT(IsArray());
   Add(new CPDF_Reference(pDoc, objnum));
 }