Get rid of NULLs in xfa/

xfa/fde/css/fde_cssstylesheet.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 XFA_FDE_CSS_FDE_CSSSTYLESHEET_H_
 #define XFA_FDE_CSS_FDE_CSSSTYLESHEET_H_
 
 #include <unordered_map>
@@ skipping 30 matching lines @@
                                          FDE_CSSSELECTORTYPE eType);
   void SetType(FDE_CSSSELECTORTYPE eType) { m_eType = eType; }
   FDE_CSSSELECTORTYPE m_eType;
   uint32_t m_dwHash;
   CFDE_CSSSelector* m_pNext;
 };
 typedef CFX_ArrayTemplate<CFDE_CSSSelector*> CFDE_CSSSelectorArray;
 
 class CFDE_CSSStyleRule : public IFDE_CSSStyleRule, public CFX_Target {
  public:
-  CFDE_CSSStyleRule() : m_ppSelector(NULL), m_iSelectors(0) {}
+  CFDE_CSSStyleRule() : m_ppSelector(nullptr), m_iSelectors(0) {}
   int32_t CountSelectorLists() const override { return m_iSelectors; }
   CFDE_CSSSelector* GetSelectorList(int32_t index) const override {
     return m_ppSelector[index];
   }
 
   CFDE_CSSDeclaration* GetDeclaration() override { return &m_Declaration; }
   CFDE_CSSDeclaration& GetDeclImp() { return m_Declaration; }
   void SetSelector(IFX_MemoryAllocator* pStaticStore,
                    const CFDE_CSSSelectorArray& list);
 
@@ skipping 75 matching lines @@
   uint16_t m_wRefCount;
   uint32_t m_dwMediaList;
   IFX_MemoryAllocator* m_pAllocator;
   CFDE_CSSRuleArray m_RuleArray;
   CFX_WideString m_szUrl;
   CFDE_CSSSelectorArray m_Selectors;
   std::unordered_map<uint32_t, FX_WCHAR*> m_StringCache;
 };
 
 #endif  // XFA_FDE_CSS_FDE_CSSSTYLESHEET_H_