Split CPDFXFA_Document apart

xfa/fxfa/include/xfa_ffapp.h

Index: xfa/fxfa/include/xfa_ffapp.h
diff --git a/xfa/fxfa/include/xfa_ffapp.h b/xfa/fxfa/include/xfa_ffapp.h
index 90bfcc024077a8e0b3a481fc7164d3c1d51eebfb..8a60ce6195dc187d4fa671f679a3eea46a5d88e2 100644
--- a/xfa/fxfa/include/xfa_ffapp.h
+++ b/xfa/fxfa/include/xfa_ffapp.h
@@ -42,10 +42,11 @@ class CXFA_FFApp {
   explicit CXFA_FFApp(IXFA_AppProvider* pProvider);
   ~CXFA_FFApp();
 
-  CXFA_FFDoc* CreateDoc(IXFA_DocProvider* pProvider,
+  CXFA_FFDoc* CreateDoc(IXFA_DocEnvironment* pDocEnvironment,
                         IFX_FileRead* pStream,
                         FX_BOOL bTakeOverFile);
-  CXFA_FFDoc* CreateDoc(IXFA_DocProvider* pProvider, CPDF_Document* pPDFDoc);
+  CXFA_FFDoc* CreateDoc(IXFA_DocEnvironment* pDocEnvironment,
+                        CPDF_Document* pPDFDoc);
   void SetDefaultFontMgr(std::unique_ptr<CXFA_DefFontMgr> pFontMgr);
 
   CXFA_FFDocHandler* GetDocHandler();