Cleanup the FF Handler proxy methods.

fpdfsdk/include/fpdfxfa/fpdfxfa_doc.h

Index: fpdfsdk/include/fpdfxfa/fpdfxfa_doc.h
diff --git a/fpdfsdk/include/fpdfxfa/fpdfxfa_doc.h b/fpdfsdk/include/fpdfxfa/fpdfxfa_doc.h
index 6d501317d6ed8b01837bcd3b058fe7c09f14e4dc..dc09c8b6566be832efb601befd598423c2123587 100644
--- a/fpdfsdk/include/fpdfxfa/fpdfxfa_doc.h
+++ b/fpdfsdk/include/fpdfxfa/fpdfxfa_doc.h
@@ -11,6 +11,7 @@
 
 #include "public/fpdfview.h"
 #include "xfa/include/fxfa/fxfa.h"
+#include "xfa/include/fxfa/xfa_ffdoc.h"
 #include "xfa/include/fxfa/xfa_ffdochandler.h"
 
 class CPDFXFA_App;
@@ -212,12 +213,13 @@ class CPDFXFA_Document : public IXFA_DocProvider {
     FXFA_LOADSTATUS_CLOSING,
     FXFA_LOADSTATUS_CLOSED
   };
+
   void CloseXFADoc(CXFA_FFDocHandler* pDoc) {
     if (pDoc) {
-      pDoc->CloseDoc(m_pXFADoc);
-      pDoc->ReleaseDoc(m_pXFADoc);
-      m_pXFADoc = NULL;
-      m_pXFADocView = NULL;
+      m_pXFADoc->CloseDoc();
+      delete m_pXFADoc;
+      m_pXFADoc = nullptr;
+      m_pXFADocView = nullptr;
     }
   }