Make CPDFXFA_App / IXFA_AppProvider saner

xfa/src/fxfa/src/app/xfa_fontmgr.cpp

Index: xfa/src/fxfa/src/app/xfa_fontmgr.cpp
diff --git a/xfa/src/fxfa/src/app/xfa_fontmgr.cpp b/xfa/src/fxfa/src/app/xfa_fontmgr.cpp
index ef49911dc1a4963c3b6bcf78110e41463d2a682c..8138e5870bb69e0859d11d6c1dff410d57b333dd 100644
--- a/xfa/src/fxfa/src/app/xfa_fontmgr.cpp
+++ b/xfa/src/fxfa/src/app/xfa_fontmgr.cpp
@@ -1010,10 +1010,15 @@ const XFA_FONTINFO* XFA_GetFontINFOByFontName(FX_WSTR wsFontName)
     return NULL;
 #endif
 }
-IXFA_FontMgr* XFA_GetDefaultFontMgr()
+// static
+IXFA_FontMgr* IXFA_FontMgr::CreateDefault()
 {
     return FX_NEW CXFA_DefFontMgr;
 }
+// virtual
+IXFA_FontMgr::~IXFA_FontMgr()
+{
+}
 CXFA_DefFontMgr::~CXFA_DefFontMgr()
 {
     FX_INT32 iCounts = m_CacheFonts.GetSize();