Remove IXFA_* interfaces.

fpdfsdk/include/fpdfxfa/fpdfxfa_app.h

Index: fpdfsdk/include/fpdfxfa/fpdfxfa_app.h
diff --git a/fpdfsdk/include/fpdfxfa/fpdfxfa_app.h b/fpdfsdk/include/fpdfxfa/fpdfxfa_app.h
index f96ed3b177c86574d1ab5fb39711d82438d60b3b..ed626716f7ee4e241f91a3f7f5ceae56c0654606 100644
--- a/fpdfsdk/include/fpdfxfa/fpdfxfa_app.h
+++ b/fpdfsdk/include/fpdfxfa/fpdfxfa_app.h
@@ -21,7 +21,7 @@ class CPDFXFA_App : public IXFA_AppProvider {
   ~CPDFXFA_App() override;
 
   FX_BOOL Initialize(FXJSE_HRUNTIME hRuntime);
-  IXFA_App* GetXFAApp() { return m_pXFAApp; }
+  CXFA_FFApp* GetXFAApp() { return m_pXFAApp; }
 
   FX_BOOL AddFormFillEnv(CPDFDoc_Environment* pEnv);
   FX_BOOL RemoveFormFillEnv(CPDFDoc_Environment* pEnv);
@@ -88,8 +88,7 @@ class CPDFXFA_App : public IXFA_AppProvider {
   static CPDFXFA_App* g_pApp;
 
   FX_BOOL m_bJavaScriptInitialized;
-  IXFA_App* m_pXFAApp;
-  IXFA_FontMgr* m_pFontMgr;
+  CXFA_FFApp* m_pXFAApp;
   FXJSE_HRUNTIME m_hJSERuntime;
   IFXJS_Runtime* m_pJSRuntime;
   CFX_WideString m_csAppType;