Get rid of NULLs in core/

core/fpdfapi/fpdf_parser/include/cpdf_document.h

 // 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
 
 #ifndef CORE_FPDFAPI_FPDF_PARSER_INCLUDE_CPDF_DOCUMENT_H_
 #define CORE_FPDFAPI_FPDF_PARSER_INCLUDE_CPDF_DOCUMENT_H_
 
 #include <memory>
@@ skipping 52 matching lines @@
 
   CPDF_DocRenderData* GetRenderData() const { return m_pDocRender.get(); }
   void ClearRenderData();
   void ClearRenderFont();
 
   FX_BOOL IsFormStream(uint32_t objnum, FX_BOOL& bForm) const;
 
   // |pFontDict| must not be null.
   CPDF_Font* LoadFont(CPDF_Dictionary* pFontDict);
   CPDF_ColorSpace* LoadColorSpace(CPDF_Object* pCSObj,
-                                  CPDF_Dictionary* pResources = NULL);
+                                  CPDF_Dictionary* pResources = nullptr);
 
   CPDF_Pattern* LoadPattern(CPDF_Object* pObj,
                             FX_BOOL bShading,
                             const CFX_Matrix& matrix);
 
   CPDF_Image* LoadImageF(CPDF_Object* pObj);
   CPDF_StreamAcc* LoadFontFile(CPDF_Stream* pStream);
   CPDF_IccProfile* LoadIccProfile(CPDF_Stream* pStream);
 
   void LoadDoc();
@@ skipping 48 matching lines @@
   uint32_t m_dwFirstPageObjNum;
   CFX_ArrayTemplate<uint32_t> m_PageList;
   // TODO(thestig): Figure out why this cannot be a std::unique_ptr.
   CPDF_DocPageData* m_pDocPage;
   std::unique_ptr<CPDF_DocRenderData> m_pDocRender;
   std::unique_ptr<CFX_Deletable> m_pCodecContext;
   std::unique_ptr<CPDF_LinkList> m_pLinksContext;
 };
 
 #endif  // CORE_FPDFAPI_FPDF_PARSER_INCLUDE_CPDF_DOCUMENT_H_