Get rid of NULLs in xfa/

xfa/fxfa/include/fxfa.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_INCLUDE_FXFA_H_
 #define XFA_FXFA_INCLUDE_FXFA_H_
 
 #include <vector>
@@ skipping 335 matching lines @@
   virtual void DisplayCaret(CXFA_FFWidget* hWidget,
                             FX_BOOL bVisible,
                             const CFX_RectF* pRtAnchor) = 0;
   virtual FX_BOOL GetPopupPos(CXFA_FFWidget* hWidget,
                               FX_FLOAT fMinPopup,
                               FX_FLOAT fMaxPopup,
                               const CFX_RectF& rtAnchor,
                               CFX_RectF& rtPopup) = 0;
   virtual FX_BOOL PopupMenu(CXFA_FFWidget* hWidget,
                             CFX_PointF ptPopup,
-                            const CFX_RectF* pRectExclude = NULL) = 0;
+                            const CFX_RectF* pRectExclude = nullptr) = 0;
   virtual void PageViewEvent(CXFA_FFPageView* pPageView, uint32_t dwFlags) = 0;
   virtual void WidgetPostAdd(CXFA_FFWidget* hWidget,
                              CXFA_WidgetAcc* pWidgetData) = 0;
   virtual void WidgetPreRemove(CXFA_FFWidget* hWidget,
                                CXFA_WidgetAcc* pWidgetData) = 0;
   virtual FX_BOOL RenderCustomWidget(CXFA_FFWidget* hWidget,
                                      CFX_Graphics* pGS,
                                      CFX_Matrix* pMatrix,
                                      const CFX_RectF& rtUI) {
     return FALSE;
@@ skipping 63 matching lines @@
   virtual CPDF_Document* OpenPDF(CXFA_FFDoc* hDoc,
                                  IFX_FileRead* pFile,
                                  FX_BOOL bTakeOverFile) = 0;
   virtual IFX_FileRead* OpenLinkedFile(CXFA_FFDoc* hDoc,
                                        const CFX_WideString& wsLink) = 0;
 };
 
 class CXFA_EventParam {
  public:
   CXFA_EventParam() {
-    m_pTarget = NULL;
+    m_pTarget = nullptr;
     m_eType = XFA_EVENT_Unknown;
     m_wsResult.clear();
     Reset();
   }
   void Reset() {
     m_wsChange.clear();
     m_iCommitKey = 0;
     m_wsFullText.clear();
     m_bKeyDown = FALSE;
     m_bModifier = FALSE;
@@ skipping 47 matching lines @@
   virtual void Reset() = 0;
   virtual CXFA_FFWidget* MoveToFirst() = 0;
   virtual CXFA_FFWidget* MoveToLast() = 0;
   virtual CXFA_FFWidget* MoveToNext() = 0;
   virtual CXFA_FFWidget* MoveToPrevious() = 0;
   virtual CXFA_FFWidget* GetCurrentWidget() = 0;
   virtual FX_BOOL SetCurrentWidget(CXFA_FFWidget* hWidget) = 0;
 };
 
 #endif  // XFA_FXFA_INCLUDE_FXFA_H_