Fix CFWL_WidgetImpDelegate hierarchy.

xfa/src/fwl/src/basewidget/fwl_editimp.cpp

Index: xfa/src/fwl/src/basewidget/fwl_editimp.cpp
diff --git a/xfa/src/fwl/src/basewidget/fwl_editimp.cpp b/xfa/src/fwl/src/basewidget/fwl_editimp.cpp
index 9f0dfa058a7626e6246c01525cce1053f4031419..07fec7f032f22b34b1fb98a7b12fe2fecc77adff 100644
--- a/xfa/src/fwl/src/basewidget/fwl_editimp.cpp
+++ b/xfa/src/fwl/src/basewidget/fwl_editimp.cpp
@@ -238,7 +238,7 @@ FWL_ERR CFWL_EditImp::Initialize() {
   _FWL_ERR_CHECK_RETURN_VALUE_IF_FAIL(CFWL_WidgetImp::Initialize(),
                                       FWL_ERR_Indefinite);
   if (!m_pDelegate) {
-    m_pDelegate = (IFWL_WidgetDelegate*)new CFWL_EditImpDelegate(this);
+    m_pDelegate = new CFWL_EditImpDelegate(this);
   }
   InitCaret();
   if (!m_pEdtEngine) {
@@ -256,10 +256,8 @@ FWL_ERR CFWL_EditImp::Finalize() {
   if (m_pVertScrollBar) {
     m_pVertScrollBar->Finalize();
   }
-  if (m_pDelegate) {
-    delete (CFWL_EditImpDelegate*)m_pDelegate;
-    m_pDelegate = NULL;
-  }
+  delete m_pDelegate;
+  m_pDelegate = nullptr;
   return CFWL_WidgetImp::Finalize();
 }
 FWL_ERR CFWL_EditImp::GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize) {