Make IFWL_Target::m_pImpl a private member.

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 6ae0a334c3425fc0e744d2505536b10d6659c48c..c8f986d4f8ae10dc057e606f07c41e08d2ee666c 100644
--- a/xfa/src/fwl/src/basewidget/fwl_pushbuttonimp.cpp
+++ b/xfa/src/fwl/src/basewidget/fwl_pushbuttonimp.cpp
@@ -13,24 +13,20 @@ IFWL_PushButton* IFWL_PushButton::Create() {
   return new IFWL_PushButton;
 }
 FWL_ERR IFWL_PushButton::Initialize(IFWL_Widget* pOuter) {
-  m_pImpl = new CFWL_PushButtonImp(pOuter);
-  ((CFWL_PushButtonImp*)m_pImpl)->SetInterface(this);
-  return ((CFWL_PushButtonImp*)m_pImpl)->Initialize();
+  CFWL_PushButtonImp* pPushButtonImpl = new CFWL_PushButtonImp(pOuter);
+  SetImpl(pPushButtonImpl);
+  pPushButtonImpl->SetInterface(this);
+  return pPushButtonImpl->Initialize();
 }
 FWL_ERR IFWL_PushButton::Initialize(const CFWL_WidgetImpProperties& properties,
                                     IFWL_Widget* pOuter) {
-  m_pImpl = new CFWL_PushButtonImp(properties, pOuter);
-  ((CFWL_PushButtonImp*)m_pImpl)->SetInterface(this);
-  return ((CFWL_PushButtonImp*)m_pImpl)->Initialize();
+  CFWL_PushButtonImp* pPushButtonImpl =
+      new CFWL_PushButtonImp(properties, pOuter);
+  SetImpl(pPushButtonImpl);
+  pPushButtonImpl->SetInterface(this);
+  return pPushButtonImpl->Initialize();
 }
 IFWL_PushButton::IFWL_PushButton() {
-  m_pImpl = NULL;
-}
-IFWL_PushButton::~IFWL_PushButton() {
-  if (m_pImpl) {
-    delete (CFWL_PushButtonImp*)m_pImpl;
-    m_pImpl = NULL;
-  }
 }
 CFWL_PushButtonImp::CFWL_PushButtonImp(IFWL_Widget* pOuter)
     : CFWL_WidgetImp(pOuter),