Get rid of NULLs in xfa/

xfa/fde/css/fde_cssstyleselector.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_CSSSTYLESELECTOR_H_
 #define XFA_FDE_CSS_FDE_CSSSTYLESELECTOR_H_
 
 #include <vector>
@@ skipping 33 matching lines @@
   void AddRulesFrom(const CFDE_CSSStyleSheetArray& sheets,
                     uint32_t dwMediaList,
                     IFGAS_FontMgr* pFontMgr);
   void Clear();
 
   int32_t CountSelectors() const { return m_iSelectors; }
   FDE_CSSRuleData* GetIDRuleData(uint32_t dwIDHash) {
     void* pData;
     return m_IDRules.Lookup((void*)(uintptr_t)dwIDHash, pData)
                ? (FDE_CSSRuleData*)pData
-               : NULL;
+               : nullptr;
   }
   FDE_CSSRuleData* GetTagRuleData(uint32_t dwTagHasn) {
     void* pData;
     return m_TagRules.Lookup((void*)(uintptr_t)dwTagHasn, pData)
                ? (FDE_CSSRuleData*)pData
-               : NULL;
+               : nullptr;
   }
   FDE_CSSRuleData* GetClassRuleData(uint32_t dwIDHash) {
     void* pData;
     return m_ClassRules.Lookup((void*)(uintptr_t)dwIDHash, pData)
                ? (FDE_CSSRuleData*)pData
-               : NULL;
+               : nullptr;
   }
   FDE_CSSRuleData* GetUniversalRuleData() { return m_pUniversalRules; }
   FDE_CSSRuleData* GetPersudoRuleData() { return m_pPersudoRules; }
 
   IFX_MemoryAllocator* m_pStaticStore;
 
  protected:
   void AddRulesFrom(IFDE_CSSStyleSheet* pStyleSheet,
                     IFDE_CSSRule* pRule,
                     uint32_t dwMediaList,
@@ skipping 500 matching lines @@
   }
 
   uint32_t m_dwRefCount;
   IFX_MemoryAllocator* m_pAllocator;
   CFDE_CSSInheritedData m_InheritedData;
   CFDE_CSSNonInheritedData m_NonInheritedData;
   CFX_WideStringArray m_CustomProperties;
 };
 
 #endif  // XFA_FDE_CSS_FDE_CSSSTYLESELECTOR_H_