Fix CFWL_WidgetImpDelegate hierarchy.

xfa/src/fwl/src/basewidget/fwl_formproxyimp.cpp

Index: xfa/src/fwl/src/basewidget/fwl_formproxyimp.cpp
diff --git a/xfa/src/fwl/src/basewidget/fwl_formproxyimp.cpp b/xfa/src/fwl/src/basewidget/fwl_formproxyimp.cpp
index 57c9490d71c668f211088287acb659bdc09d5e00..87752afa6e110f14f4d2832257f323b61ae1f686 100644
--- a/xfa/src/fwl/src/basewidget/fwl_formproxyimp.cpp
+++ b/xfa/src/fwl/src/basewidget/fwl_formproxyimp.cpp
@@ -33,14 +33,12 @@ FX_BOOL CFWL_FormProxyImp::IsInstance(const CFX_WideStringC& wsClass) const {
 FWL_ERR CFWL_FormProxyImp::Initialize() {
   _FWL_ERR_CHECK_RETURN_VALUE_IF_FAIL(CFWL_WidgetImp::Initialize(),
                                       FWL_ERR_Indefinite);
-  m_pDelegate = (IFWL_WidgetDelegate*)new CFWL_FormProxyImpDelegate(this);
+  m_pDelegate = new CFWL_FormProxyImpDelegate(this);
   return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_FormProxyImp::Finalize() {
-  if (m_pDelegate) {
-    delete (CFWL_FormProxyImpDelegate*)m_pDelegate;
-    m_pDelegate = NULL;
-  }
+  delete m_pDelegate;
+  m_pDelegate = nullptr;
   return CFWL_WidgetImp::Finalize();
 }
 FWL_ERR CFWL_FormProxyImp::Update() {