Get rid of NULLs in fpdfsdk/

fpdfsdk/pdfwindow/PWL_ComboBox.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_ComboBox.h"
 
 #include "core/fxge/include/fx_ge.h"
 #include "fpdfsdk/pdfwindow/PWL_Edit.h"
@@ skipping 151 matching lines @@
         IsFloatBigger(rectWnd.top - rectWnd.bottom,
                       PWL_CBBUTTON_TRIANGLE_HALFLEN)) {
       CFX_PathData path;
 
       path.SetPointCount(4);
       path.SetPoint(0, pt1.x, pt1.y, FXPT_MOVETO);
       path.SetPoint(1, pt2.x, pt2.y, FXPT_LINETO);
       path.SetPoint(2, pt3.x, pt3.y, FXPT_LINETO);
       path.SetPoint(3, pt1.x, pt1.y, FXPT_LINETO);
 
-      pDevice->DrawPath(&path, pUser2Device, NULL,
+      pDevice->DrawPath(&path, pUser2Device, nullptr,
                         CPWL_Utils::PWLColorToFXColor(PWL_DEFAULT_BLACKCOLOR,
                                                       GetTransparency()),
                         0, FXFILL_ALTERNATE);
     }
   }
 }
 
 FX_BOOL CPWL_CBButton::OnLButtonDown(const CFX_FloatPoint& point,
                                      uint32_t nFlag) {
   CPWL_Wnd::OnLButtonDown(point, nFlag);
@@ skipping 11 matching lines @@
 FX_BOOL CPWL_CBButton::OnLButtonUp(const CFX_FloatPoint& point,
                                    uint32_t nFlag) {
   CPWL_Wnd::OnLButtonUp(point, nFlag);
 
   ReleaseCapture();
 
   return TRUE;
 }
 
 CPWL_ComboBox::CPWL_ComboBox()
-    : m_pEdit(NULL),
-      m_pButton(NULL),
-      m_pList(NULL),
+    : m_pEdit(nullptr),
+      m_pButton(nullptr),
+      m_pList(nullptr),
       m_bPopup(FALSE),
       m_nPopupWhere(0),
       m_nSelectItem(-1),
-      m_pFillerNotify(NULL) {}
+      m_pFillerNotify(nullptr) {}
 
 CFX_ByteString CPWL_ComboBox::GetClassName() const {
   return "CPWL_ComboBox";
 }
 
 void CPWL_ComboBox::OnCreate(PWL_CREATEPARAM& cp) {
   cp.dwFlags &= ~PWS_HSCROLL;
   cp.dwFlags &= ~PWS_VSCROLL;
 }
 
@@ skipping 422 matching lines @@
 
 void CPWL_ComboBox::SetFillerNotify(IPWL_Filler_Notify* pNotify) {
   m_pFillerNotify = pNotify;
 
   if (m_pEdit)
     m_pEdit->SetFillerNotify(pNotify);
 
   if (m_pList)
     m_pList->SetFillerNotify(pNotify);
 }