Get rid of NULLs in xfa/

xfa/fxfa/app/xfa_fftextedit.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_FXFA_APP_XFA_FFTEXTEDIT_H_
 #define XFA_FXFA_APP_XFA_FFTEXTEDIT_H_
 
 #include <vector>
@@ skipping 29 matching lines @@
   FX_BOOL DeSelect() override;
   FX_BOOL GetSuggestWords(CFX_PointF pointf,
                           std::vector<CFX_ByteString>& sSuggest) override;
   FX_BOOL ReplaceSpellCheckWord(CFX_PointF pointf,
                                 const CFX_ByteStringC& bsReplace) override;
 
   // IFWL_WidgetDelegate:
   void OnProcessMessage(CFWL_Message* pMessage) override;
   void OnProcessEvent(CFWL_Event* pEvent) override;
   void OnDrawWidget(CFX_Graphics* pGraphics,
-                    const CFX_Matrix* pMatrix = NULL) override;
+                    const CFX_Matrix* pMatrix = nullptr) override;
 
   void OnTextChanged(IFWL_Widget* pWidget,
                      const CFX_WideString& wsChanged,
                      const CFX_WideString& wsPrevText);
   void OnTextFull(IFWL_Widget* pWidget);
   FX_BOOL CheckWord(const CFX_ByteStringC& sWord);
   FX_BOOL GetSuggestWords(const CFX_ByteStringC& sWord,
                           std::vector<CFX_ByteString>& sSuggest);
 
  protected:
@@ skipping 68 matching lines @@
 
  public:
   void OnSelectChanged(IFWL_Widget* pWidget,
                        int32_t iYear,
                        int32_t iMonth,
                        int32_t iDay);
   virtual void OnProcessEvent(CFWL_Event* pEvent);
 };
 
 #endif  // XFA_FXFA_APP_XFA_FFTEXTEDIT_H_