Get rid of NULLs in core/

core/fxcodec/jbig2/JBig2_Context.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_FXCODEC_JBIG2_JBIG2_CONTEXT_H_
 #define CORE_FXCODEC_JBIG2_JBIG2_CONTEXT_H_
 
 #include <list>
@@ skipping 26 matching lines @@
 #define JBIG2_ERROR_STREAM_TYPE -5
 #define JBIG2_ERROR_LIMIT -6
 #define JBIG2_MIN_SEGMENT_SIZE 11
 
 class CJBig2_Context {
  public:
   static CJBig2_Context* CreateContext(
       CPDF_StreamAcc* pGlobalStream,
       CPDF_StreamAcc* pSrcStream,
       std::list<CJBig2_CachePair>* pSymbolDictCache,
-      IFX_Pause* pPause = NULL);
+      IFX_Pause* pPause = nullptr);
 
   static void DestroyContext(CJBig2_Context* pContext);
 
   int32_t getFirstPage(uint8_t* pBuf,
                        int32_t width,
                        int32_t height,
                        int32_t stride,
                        IFX_Pause* pPause);
 
   int32_t Continue(IFX_Pause* pPause);
@@ skipping 67 matching lines @@
   std::unique_ptr<CJBig2_GRDProc> m_pGRD;
   JBig2ArithCtx* m_gbContext;
   std::unique_ptr<CJBig2_Segment> m_pSegment;
   uint32_t m_dwOffset;
   JBig2RegionInfo m_ri;
   std::list<CJBig2_CachePair>* const m_pSymbolDictCache;
   bool m_bIsGlobal;
 };
 
 #endif  // CORE_FXCODEC_JBIG2_JBIG2_CONTEXT_H_