Fix CFWL_WidgetImpDelegate hierarchy.

xfa/src/fwl/src/basewidget/fwl_tooltipctrlimp.cpp

Index: xfa/src/fwl/src/basewidget/fwl_tooltipctrlimp.cpp
diff --git a/xfa/src/fwl/src/basewidget/fwl_tooltipctrlimp.cpp b/xfa/src/fwl/src/basewidget/fwl_tooltipctrlimp.cpp
index cbc27caf855d6247a76f5720579f498f82b4daab..f466764e39f6c002ceea03c17f7db3a98fee4c79 100644
--- a/xfa/src/fwl/src/basewidget/fwl_tooltipctrlimp.cpp
+++ b/xfa/src/fwl/src/basewidget/fwl_tooltipctrlimp.cpp
@@ -79,14 +79,12 @@ FWL_ERR CFWL_ToolTipImp::Initialize() {
   m_pProperties->m_dwStyles &= ~FWL_WGTSTYLE_Child;
   _FWL_ERR_CHECK_RETURN_VALUE_IF_FAIL(CFWL_WidgetImp::Initialize(),
                                       FWL_ERR_Indefinite);
-  m_pDelegate = (IFWL_WidgetDelegate*)new CFWL_ToolTipImpDelegate(this);
+  m_pDelegate = new CFWL_ToolTipImpDelegate(this);
   return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_ToolTipImp::Finalize() {
-  if (m_pDelegate) {
-    delete (CFWL_ToolTipImpDelegate*)m_pDelegate;
-    m_pDelegate = NULL;
-  }
+  delete m_pDelegate;
+  m_pDelegate = nullptr;
   return CFWL_WidgetImp::Finalize();
 }
 FWL_ERR CFWL_ToolTipImp::GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize) {