Get rid of NULLs in core/

xfa/fwl/core/ifwl_widget.h

 // 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
 
 #ifndef XFA_FWL_CORE_IFWL_WIDGET_H_
 #define XFA_FWL_CORE_IFWL_WIDGET_H_
 
 #include <memory>
@@ skipping 41 matching lines @@
 class CFWL_WidgetImp;
 class CFX_Graphics;
 class IFWL_App;
 class IFWL_DataProvider;
 class IFWL_Form;
 class IFWL_ThemeProvider;
 class IFWL_WidgetDelegate;
 
 class IFWL_Widget {
  public:
-  IFWL_Widget() : m_pImpl(nullptr) {}
+  IFWL_Widget();
   virtual ~IFWL_Widget();
 
   FWL_Error GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize = FALSE);
   FWL_Error GetGlobalRect(CFX_RectF& rect);
   FWL_Error SetWidgetRect(const CFX_RectF& rect);
   FWL_Error GetClientRect(CFX_RectF& rect);
   IFWL_Widget* GetParent();
   FWL_Error SetParent(IFWL_Widget* pParent);
   IFWL_Widget* GetOwner();
   FWL_Error SetOwner(IFWL_Widget* pOwner);
@@ skipping 40 matching lines @@
 
  protected:
   // Takes ownership of |pImpl|.
   void SetImpl(CFWL_WidgetImp* pImpl) { m_pImpl.reset(pImpl); }
 
  private:
   std::unique_ptr<CFWL_WidgetImp> m_pImpl;
 };
 
 #endif  // XFA_FWL_CORE_IFWL_WIDGET_H_