Fix CFWL_WidgetImpDelegate hierarchy.

xfa/src/fwl/src/basewidget/fwl_spinbuttonimp.cpp

Index: xfa/src/fwl/src/basewidget/fwl_spinbuttonimp.cpp
diff --git a/xfa/src/fwl/src/basewidget/fwl_spinbuttonimp.cpp b/xfa/src/fwl/src/basewidget/fwl_spinbuttonimp.cpp
index cc87f51111eda08192d3733b013a5bccfb1b9247..2b00584dd9585520512d54b02eb1f6f26787da15 100644
--- a/xfa/src/fwl/src/basewidget/fwl_spinbuttonimp.cpp
+++ b/xfa/src/fwl/src/basewidget/fwl_spinbuttonimp.cpp
@@ -68,14 +68,12 @@ FX_DWORD CFWL_SpinButtonImp::GetClassID() const {
 FWL_ERR CFWL_SpinButtonImp::Initialize() {
   _FWL_ERR_CHECK_RETURN_VALUE_IF_FAIL(CFWL_WidgetImp::Initialize(),
                                       FWL_ERR_Indefinite);
-  m_pDelegate = (IFWL_WidgetDelegate*)new CFWL_SpinButtonImpDelegate(this);
+  m_pDelegate = new CFWL_SpinButtonImpDelegate(this);
   return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_SpinButtonImp::Finalize() {
-  if (m_pDelegate) {
-    delete (CFWL_SpinButtonImpDelegate*)m_pDelegate;
-    m_pDelegate = NULL;
-  }
+  delete m_pDelegate;
+  m_pDelegate = nullptr;
   return CFWL_WidgetImp::Finalize();
 }
 FWL_ERR CFWL_SpinButtonImp::GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize) {