Get rid of NULLs in fpdfsdk/

fpdfsdk/pdfwindow/PWL_Signature.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_Signature.h"
 
 #include "core/fxge/include/fx_ge.h"
 #include "fpdfsdk/pdfwindow/PWL_Icon.h"
 #include "fpdfsdk/pdfwindow/PWL_Label.h"
 #include "fpdfsdk/pdfwindow/PWL_Utils.h"
 #include "fpdfsdk/pdfwindow/PWL_Wnd.h"
 
-CPWL_Signature_Image::CPWL_Signature_Image() : m_pImage(NULL) {}
+CPWL_Signature_Image::CPWL_Signature_Image() : m_pImage(nullptr) {}
 
 CPWL_Signature_Image::~CPWL_Signature_Image() {}
 
 void CPWL_Signature_Image::SetImage(CFX_DIBSource* pImage) {
   m_pImage = pImage;
 }
 
 CFX_DIBSource* CPWL_Signature_Image::GetImage() {
   return m_pImage;
 }
@@ skipping 24 matching lines @@
 
   GetImageSize(fImageW, fImageH);
 
   CFX_FloatRect rcClient = GetClientRect();
 
   fHScale = rcClient.Width() / fImageW;
   fVScale = rcClient.Height() / fImageH;
 }
 
 CPWL_Signature::CPWL_Signature()
-    : m_pText(NULL),
-      m_pDescription(NULL),
-      m_pImage(NULL),
+    : m_pText(nullptr),
+      m_pDescription(nullptr),
+      m_pImage(nullptr),
       m_bTextExist(TRUE),
       m_bImageExist(FALSE),
       m_bFlagExist(TRUE) {}
 
 CPWL_Signature::~CPWL_Signature() {}
 
 void CPWL_Signature::SetTextFlag(FX_BOOL bTextExist) {
   m_bTextExist = bTextExist;
 
   RePosChildWnd();
@@ skipping 96 matching lines @@
         pDevice, pUser2Device, PWL_ICONTYPE_FOXIT,
         CPWL_Utils::GetCenterSquare(GetClientRect()),
         CPWL_Color(COLORTYPE_RGB, 0.91f, 0.855f, 0.92f),
         CPWL_Color(COLORTYPE_TRANSPARENT), 255);
   }
 }
 
 void CPWL_Signature::GetThisAppearanceStream(CFX_ByteTextBuf& sAppStream) {
   CPWL_Wnd::GetThisAppearanceStream(sAppStream);
 }