Get rid of NULLs in core/

core/fpdfapi/fpdf_page/pageint.h

 // 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
 
 #ifndef CORE_FPDFAPI_FPDF_PAGE_PAGEINT_H_
 #define CORE_FPDFAPI_FPDF_PAGE_PAGEINT_H_
 
 #include <map>
@@ skipping 34 matching lines @@
   ~CPDF_StreamParser();
 
   CPDF_Stream* ReadInlineStream(CPDF_Document* pDoc,
                                 CPDF_Dictionary* pDict,
                                 CPDF_Object* pCSObj);
   SyntaxType ParseNextElement();
   uint8_t* GetWordBuf() { return m_WordBuffer; }
   uint32_t GetWordSize() const { return m_WordSize; }
   CPDF_Object* GetObject() {
     CPDF_Object* pObj = m_pLastObj;
-    m_pLastObj = NULL;
+    m_pLastObj = nullptr;
     return pObj;
   }
   uint32_t GetPos() const { return m_Pos; }
   void SetPos(uint32_t pos) { m_Pos = pos; }
   CPDF_Object* ReadNextObject(bool bAllowNestedArray, uint32_t dwInArrayLevel);
 
  protected:
   friend class fpdf_page_parser_old_ReadHexString_Test;
 
   void GetNextWord(FX_BOOL& bIsNumber);
@@ skipping 487 matching lines @@
 };
 
 CFX_ByteStringC PDF_FindKeyAbbreviationForTesting(const CFX_ByteStringC& abbr);
 CFX_ByteStringC PDF_FindValueAbbreviationForTesting(
     const CFX_ByteStringC& abbr);
 
 void PDF_ReplaceAbbr(CPDF_Object* pObj);
 bool IsPathOperator(const uint8_t* buf, size_t len);
 
 #endif  // CORE_FPDFAPI_FPDF_PAGE_PAGEINT_H_