Change IFWL_Widget to store a single delegate.

xfa/fwl/core/ifwl_widget.cpp

Index: xfa/fwl/core/ifwl_widget.cpp
diff --git a/xfa/fwl/core/ifwl_widget.cpp b/xfa/fwl/core/ifwl_widget.cpp
index 961c02497bd78e9a208a9986bc99ab3b466093c4..e4b04d7d0645c8ac13fdfd2f4b20c90655413e08 100644
--- a/xfa/fwl/core/ifwl_widget.cpp
+++ b/xfa/fwl/core/ifwl_widget.cpp
@@ -30,7 +30,6 @@ IFWL_Widget::IFWL_Widget(const IFWL_App* app,
     : m_pOwnerApp(app),
       m_pWidgetMgr(app->GetWidgetMgr()),
       m_pProperties(new CFWL_WidgetImpProperties(properties)),
-      m_pCurDelegate(nullptr),
       m_pOuter(pOuter),
       m_pLayoutItem(nullptr),
       m_pAssociate(nullptr),
@@ -97,7 +96,7 @@ FWL_Error IFWL_Widget::SetWidgetRect(const CFX_RectF& rect) {
       ev.m_rtOld = rtOld;
       ev.m_rtNew = rect;
 
-      if (IFWL_WidgetDelegate* pDelegate = GetCurrentDelegate())
+      if (IFWL_WidgetDelegate* pDelegate = GetDelegate())
         pDelegate->OnProcessEvent(&ev);
     }
     return FWL_Error::Succeeded;
@@ -348,16 +347,6 @@ FWL_Error IFWL_Widget::SetThemeProvider(IFWL_ThemeProvider* pThemeProvider) {
   return FWL_Error::Succeeded;
 }
 
-IFWL_WidgetDelegate* IFWL_Widget::GetCurrentDelegate() {
-  if (!m_pCurDelegate)
-    m_pCurDelegate = m_pDelegate.get();
-  return m_pCurDelegate;
-}
-
-void IFWL_Widget::SetCurrentDelegate(IFWL_WidgetDelegate* pDelegate) {
-  m_pCurDelegate = pDelegate;
-}
-
 const IFWL_App* IFWL_Widget::GetOwnerApp() const {
   return m_pOwnerApp;
 }
@@ -720,7 +709,7 @@ void IFWL_Widget::DispatchKeyEvent(CFWL_MsgKey* pNote) {
 
 void IFWL_Widget::DispatchEvent(CFWL_Event* pEvent) {
   if (m_pOuter) {
-    m_pOuter->GetCurrentDelegate()->OnProcessEvent(pEvent);
+    m_pOuter->GetDelegate()->OnProcessEvent(pEvent);
     return;
   }
   const IFWL_App* pApp = GetOwnerApp();