Use smart pointers for class owned pointers in xfa/fxfa

fpdfsdk/fsdk_baseform.cpp

Index: fpdfsdk/fsdk_baseform.cpp
diff --git a/fpdfsdk/fsdk_baseform.cpp b/fpdfsdk/fsdk_baseform.cpp
index 1bd60b11e9fbcb96e3569d63616c5baa5b85a0ac..c5c6187c4e57d3ad0af820aa59ab6096c7997938 100644
--- a/fpdfsdk/fsdk_baseform.cpp
+++ b/fpdfsdk/fsdk_baseform.cpp
@@ -115,7 +115,7 @@ CXFA_FFWidget* CPDFSDK_Widget::GetMixXFAWidget() const {
         }
 
         if (!sName.IsEmpty())
-          m_hMixXFAWidget = pDocView->GetWidgetByName(sName);
+          m_hMixXFAWidget = pDocView->GetWidgetByName(sName, nullptr);
       }
     }
     return m_hMixXFAWidget;
@@ -131,7 +131,7 @@ CXFA_FFWidget* CPDFSDK_Widget::GetGroupMixXFAWidget() {
     if (CXFA_FFDocView* pDocView = pDoc->GetXFADocView()) {
       CFX_WideString sName = GetName();
       if (!sName.IsEmpty())
-        return pDocView->GetWidgetByName(sName);
+        return pDocView->GetWidgetByName(sName, nullptr);
     }
   }