Get rid of NULLs in fpdfsdk/

fpdfsdk/pdfwindow/PWL_Edit.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 "fpdfsdk/pdfwindow/PWL_Edit.h"
 
 #include <vector>
 
@@ skipping 370 matching lines @@
         }
         break;
       }
       default:
         break;
     }
   }
 
   CFX_FloatRect rcClip;
   CPVT_WordRange wrRange = m_pEdit->GetVisibleWordRange();
-  CPVT_WordRange* pRange = NULL;
+  CPVT_WordRange* pRange = nullptr;
 
   if (!HasFlag(PES_TEXTOVERFLOW)) {
     rcClip = GetClientRect();
     pRange = &wrRange;
   }
   CFX_SystemHandler* pSysHandler = GetSystemHandler();
   IFX_Edit::DrawEdit(
       pDevice, pUser2Device, m_pEdit,
       CPWL_Utils::PWLColorToFXColor(GetTextColor(), GetTransparency()),
       CPWL_Utils::PWLColorToFXColor(GetTextStrokeColor(), GetTransparency()),
@@ skipping 529 matching lines @@
 
   range.Set(wpStart, wpEnd);
   return range;
 }
 
 void CPWL_Edit::GeneratePageObjects(
     CPDF_PageObjectHolder* pObjectHolder,
     const CFX_FloatPoint& ptOffset,
     CFX_ArrayTemplate<CPDF_TextObject*>& ObjArray) {
   IFX_Edit::GeneratePageObjects(
-      pObjectHolder, m_pEdit, ptOffset, NULL,
+      pObjectHolder, m_pEdit, ptOffset, nullptr,
       CPWL_Utils::PWLColorToFXColor(GetTextColor(), GetTransparency()),
       ObjArray);
 }
 
 void CPWL_Edit::GeneratePageObjects(CPDF_PageObjectHolder* pObjectHolder,
                                     const CFX_FloatPoint& ptOffset) {
   CFX_ArrayTemplate<CPDF_TextObject*> ObjArray;
   IFX_Edit::GeneratePageObjects(
-      pObjectHolder, m_pEdit, ptOffset, NULL,
+      pObjectHolder, m_pEdit, ptOffset, nullptr,
       CPWL_Utils::PWLColorToFXColor(GetTextColor(), GetTransparency()),
       ObjArray);
 }