Get rid of NULLs in xfa/

xfa/fwl/lightwidget/cfwl_picturebox.h

Index: xfa/fwl/lightwidget/cfwl_picturebox.h
diff --git a/xfa/fwl/lightwidget/cfwl_picturebox.h b/xfa/fwl/lightwidget/cfwl_picturebox.h
index 8b0b13de24cc52780dec3b748919a3183d36f4e5..f8f07820f5af43bb9b1e610d977accb884d96977 100644
--- a/xfa/fwl/lightwidget/cfwl_picturebox.h
+++ b/xfa/fwl/lightwidget/cfwl_picturebox.h
@@ -14,7 +14,7 @@
 class CFWL_PictureBox : public CFWL_Widget {
  public:
   static CFWL_PictureBox* Create();
-  FWL_Error Initialize(const CFWL_WidgetProperties* pProperties = NULL);
+  FWL_Error Initialize(const CFWL_WidgetProperties* pProperties = nullptr);
   CFX_DIBitmap* GetPicture();
   FWL_Error SetPicture(CFX_DIBitmap* pBitmap);
   FX_FLOAT GetRotation();
@@ -39,7 +39,7 @@ class CFWL_PictureBox : public CFWL_Widget {
       m_fScaleY = 1.0f;
       m_fOffSetX = 0.0f;
       m_fOffSetY = 0.0f;
-      m_pBitmap = NULL;
+      m_pBitmap = nullptr;
     }
     virtual FWL_Error GetCaption(IFWL_Widget* pWidget,
                                  CFX_WideString& wsCaption);