Remove NULL in xfa/

xfa/fde/css/fde_cssstylesheet.cpp

 // 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
 
 #include "xfa/fde/css/fde_cssstylesheet.h"
 
 #include <memory>
 
@@ skipping 359 matching lines @@
       case FDE_CSSSYNTAXSTATUS_PropertyName:
       case FDE_CSSSYNTAXSTATUS_PropertyValue:
         break;
       case FDE_CSSSYNTAXSTATUS_DeclClose:
         return FDE_CSSSYNTAXSTATUS_None;
         FDE_CSSSWITCHDEFAULTS();
     }
   }
 }
 
-CFDE_CSSStyleRule::CFDE_CSSStyleRule() : m_ppSelector(NULL), m_iSelectors(0) {}
+CFDE_CSSStyleRule::CFDE_CSSStyleRule()
+    : m_ppSelector(nullptr), m_iSelectors(0) {}
 
 int32_t CFDE_CSSStyleRule::CountSelectorLists() const {
   return m_iSelectors;
 }
 
 CFDE_CSSSelector* CFDE_CSSStyleRule::GetSelectorList(int32_t index) const {
   return m_ppSelector[index];
 }
 
 CFDE_CSSDeclaration* CFDE_CSSStyleRule::GetDeclaration() {
@@ skipping 185 matching lines @@
   if (!pPersudoFirst)
     return pFirst;
 
   pPersudoLast->SetNext(pFirst);
   return pPersudoFirst;
 }
 
 CFDE_CSSDeclaration* CFDE_CSSFontFaceRule::GetDeclaration() {
   return &m_Declaration;
 }