Get rid of NULLs in core/

xfa/fwl/core/fwl_widgetimp.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 "xfa/fwl/core/fwl_widgetimp.h"
 
 #include <algorithm>
 
 #include "xfa/fde/tto/fde_textout.h"
 #include "xfa/fwl/basewidget/ifwl_combobox.h"
 #include "xfa/fwl/basewidget/ifwl_datetimepicker.h"
 #include "xfa/fwl/core/cfwl_message.h"
 #include "xfa/fwl/core/cfwl_themebackground.h"
 #include "xfa/fwl/core/cfwl_themepart.h"
 #include "xfa/fwl/core/cfwl_themetext.h"
 #include "xfa/fwl/core/cfwl_widgetmgr.h"
 #include "xfa/fwl/core/fwl_appimp.h"
 #include "xfa/fwl/core/fwl_noteimp.h"
 #include "xfa/fwl/core/ifwl_app.h"
 #include "xfa/fwl/core/ifwl_form.h"
 #include "xfa/fwl/core/ifwl_themeprovider.h"
 #include "xfa/fxfa/include/xfa_ffapp.h"
 
 #define FWL_STYLEEXT_MNU_Vert (1L << 0)
 
+IFWL_Widget::IFWL_Widget() {}
+
 IFWL_Widget::~IFWL_Widget() {}
 
 FWL_Error IFWL_Widget::GetClassName(CFX_WideString& wsClass) const {
   return m_pImpl->GetClassName(wsClass);
 }
 
 FWL_Type IFWL_Widget::GetClassID() const {
   return m_pImpl->GetClassID();
 }
 
@@ skipping 1003 matching lines @@
   }
 }
 
 void CFWL_WidgetImpDelegate::OnProcessEvent(CFWL_Event* pEvent) {}
 
 void CFWL_WidgetImpDelegate::OnDrawWidget(CFX_Graphics* pGraphics,
                                           const CFX_Matrix* pMatrix) {
   CFWL_EvtDraw evt;
   evt.m_pGraphics = pGraphics;
 }