Return unique_ptr from CXFA_FFApp::CreateDoc.

xfa/fxfa/xfa_ffapp.h

Index: xfa/fxfa/xfa_ffapp.h
diff --git a/xfa/fxfa/xfa_ffapp.h b/xfa/fxfa/xfa_ffapp.h
index bc6e948ebfa30b52484e447b571e788e8eaed2ad..411fd2d273bcb54d51230aefdb8e6002df70ce2c 100644
--- a/xfa/fxfa/xfa_ffapp.h
+++ b/xfa/fxfa/xfa_ffapp.h
@@ -35,10 +35,8 @@ class CXFA_FFApp {
   explicit CXFA_FFApp(IXFA_AppProvider* pProvider);
   ~CXFA_FFApp();
 
-  CXFA_FFDoc* CreateDoc(IXFA_DocEnvironment* pDocEnvironment,
-                        const CFX_RetainPtr<IFX_SeekableReadStream>& pStream);
-  CXFA_FFDoc* CreateDoc(IXFA_DocEnvironment* pDocEnvironment,
-                        CPDF_Document* pPDFDoc);
+  std::unique_ptr<CXFA_FFDoc> CreateDoc(IXFA_DocEnvironment* pDocEnvironment,
+                                        CPDF_Document* pPDFDoc);
   void SetDefaultFontMgr(std::unique_ptr<CXFA_DefFontMgr> pFontMgr);
 
   CXFA_FFDocHandler* GetDocHandler();