Get rid of NULLs in core/

core/fpdfapi/fpdf_font/cpdf_cidfont.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_FONT_CPDF_CIDFONT_H_
 #define CORE_FPDFAPI_FPDF_FONT_CPDF_CIDFONT_H_
 
 #include <memory>
@@ skipping 22 matching lines @@
  public:
   CPDF_CIDFont();
   ~CPDF_CIDFont() override;
 
   static FX_FLOAT CIDTransformToFloat(uint8_t ch);
 
   // CPDF_Font:
   bool IsCIDFont() const override;
   const CPDF_CIDFont* AsCIDFont() const override;
   CPDF_CIDFont* AsCIDFont() override;
-  int GlyphFromCharCode(uint32_t charcode, FX_BOOL* pVertGlyph = NULL) override;
+  int GlyphFromCharCode(uint32_t charcode,
+                        FX_BOOL* pVertGlyph = nullptr) override;
   int GetCharWidthF(uint32_t charcode, int level = 0) override;
   FX_RECT GetCharBBox(uint32_t charcode, int level = 0) override;
   uint32_t GetNextChar(const FX_CHAR* pString,
                        int nStrLen,
                        int& offset) const override;
   int CountChar(const FX_CHAR* pString, int size) const override;
   int AppendChar(FX_CHAR* str, uint32_t charcode) const override;
   int GetCharSize(uint32_t charcode) const override;
   FX_BOOL IsVertWriting() const override;
   FX_BOOL IsUnicodeCompatible() const override;
@@ skipping 28 matching lines @@
   FX_SMALL_RECT m_CharBBox[256];
   CFX_ArrayTemplate<uint32_t> m_WidthList;
   short m_DefaultVY;
   short m_DefaultW1;
   CFX_ArrayTemplate<uint32_t> m_VertMetrics;
   FX_BOOL m_bAdobeCourierStd;
   std::unique_ptr<CFX_CTTGSUBTable> m_pTTGSUBTable;
 };
 
 #endif  // CORE_FPDFAPI_FPDF_FONT_CPDF_CIDFONT_H_