Fix CFWL_WidgetImpDelegate hierarchy.

xfa/src/fwl/src/basewidget/fwl_pushbuttonimp.cpp

Index: xfa/src/fwl/src/basewidget/fwl_pushbuttonimp.cpp
diff --git a/xfa/src/fwl/src/basewidget/fwl_pushbuttonimp.cpp b/xfa/src/fwl/src/basewidget/fwl_pushbuttonimp.cpp
index 49719a91ac1de87c1bb9de5110c6633f0f38d5d6..3c21040604c5efdc0ce75905b119d7bde509f41c 100644
--- a/xfa/src/fwl/src/basewidget/fwl_pushbuttonimp.cpp
+++ b/xfa/src/fwl/src/basewidget/fwl_pushbuttonimp.cpp
@@ -51,14 +51,12 @@ FX_DWORD CFWL_PushButtonImp::GetClassID() const {
 FWL_ERR CFWL_PushButtonImp::Initialize() {
   _FWL_ERR_CHECK_RETURN_VALUE_IF_FAIL(CFWL_WidgetImp::Initialize(),
                                       FWL_ERR_Indefinite);
-  m_pDelegate = (IFWL_WidgetDelegate*)new CFWL_PushButtonImpDelegate(this);
+  m_pDelegate = new CFWL_PushButtonImpDelegate(this);
   return FWL_ERR_Succeeded;
 }
 FWL_ERR CFWL_PushButtonImp::Finalize() {
-  if (m_pDelegate) {
-    delete (CFWL_PushButtonImpDelegate*)m_pDelegate;
-    m_pDelegate = NULL;
-  }
+  delete m_pDelegate;
+  m_pDelegate = nullptr;
   return CFWL_WidgetImp::Finalize();
 }
 FWL_ERR CFWL_PushButtonImp::GetWidgetRect(CFX_RectF& rect, FX_BOOL bAutoSize) {