Get rid of NULLs in core/

core/fxcrt/include/fx_xml.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_FXCRT_INCLUDE_FX_XML_H_
 #define CORE_FXCRT_INCLUDE_FX_XML_H_
 
 #include <memory>
@@ skipping 35 matching lines @@
   CFX_WideString m_Content;
 };
 
 class CXML_Element {
  public:
   enum ChildType { Invalid, Element, Content };
 
   static CXML_Element* Parse(const void* pBuffer,
                              size_t size,
                              FX_BOOL bSaveSpaceChars = FALSE,
-                             FX_FILESIZE* pParsedSize = NULL);
+                             FX_FILESIZE* pParsedSize = nullptr);
   static CXML_Element* Parse(IFX_FileRead* pFile,
                              FX_BOOL bSaveSpaceChars = FALSE,
-                             FX_FILESIZE* pParsedSize = NULL);
+                             FX_FILESIZE* pParsedSize = nullptr);
   static CXML_Element* Parse(IFX_BufferRead* pBuffer,
                              FX_BOOL bSaveSpaceChars = FALSE,
-                             FX_FILESIZE* pParsedSize = NULL);
+                             FX_FILESIZE* pParsedSize = nullptr);
 
   CXML_Element(const CFX_ByteStringC& qSpace, const CFX_ByteStringC& tagName);
   CXML_Element(const CFX_ByteStringC& qTagName);
   CXML_Element();
   ~CXML_Element();
 
   void Empty();
   CFX_ByteString GetTagName(FX_BOOL bQualified = FALSE) const;
   CFX_ByteString GetNamespace(FX_BOOL bQualified = FALSE) const;
   CFX_ByteString GetNamespaceURI(const CFX_ByteString& qName) const;
@@ skipping 87 matching lines @@
   CFX_ByteString m_QSpaceName;
   CFX_ByteString m_TagName;
   CXML_AttrMap m_AttrMap;
   std::vector<ChildRecord> m_Children;
 
   friend class CXML_Parser;
   friend class CXML_Composer;
 };
 
 #endif  // CORE_FXCRT_INCLUDE_FX_XML_H_