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 50d0eac8a8fcec9371d6152d46f009aa7e3dc708..bb710915cca479ab4e91ee71f48a44ee3e58a775 100644
--- a/fpdfsdk/fsdk_baseform.cpp
+++ b/fpdfsdk/fsdk_baseform.cpp
@@ -114,7 +114,7 @@ CXFA_FFWidget* CPDFSDK_Widget::GetMixXFAWidget() const {
         }
 
         if (!sName.IsEmpty())
-          m_hMixXFAWidget = pDocView->GetWidgetByName(sName);
+          m_hMixXFAWidget = pDocView->GetWidgetByName(sName, nullptr);
       }
     }
     return m_hMixXFAWidget;
@@ -130,7 +130,7 @@ 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);
     }
   }