Remove no-op ShowFileDialog(s).

fpdfsdk/fpdfxfa/fpdfxfa_app.cpp

Index: fpdfsdk/fpdfxfa/fpdfxfa_app.cpp
diff --git a/fpdfsdk/fpdfxfa/fpdfxfa_app.cpp b/fpdfsdk/fpdfxfa/fpdfxfa_app.cpp
index 5a7d24ee8828a35d0319a9f3807fea63d8484e10..f9c3ca65a3f204125a81f25b068202b572e4f7fb 100644
--- a/fpdfsdk/fpdfxfa/fpdfxfa_app.cpp
+++ b/fpdfsdk/fpdfxfa/fpdfxfa_app.cpp
@@ -514,13 +514,6 @@ void CPDFXFA_App::LoadString(int32_t iStringID, CFX_WideString& wsString) {
   }
 }
 
-FX_BOOL CPDFXFA_App::ShowFileDialog(const CFX_WideStringC& wsTitle,
-                                    const CFX_WideStringC& wsFilter,
-                                    CFX_WideStringArray& wsPathArr,
-                                    FX_BOOL bOpen) {
-  return FALSE;
-}
-
 IFWL_AdapterTimerMgr* CPDFXFA_App::GetTimerMgr() {
   CXFA_FWLAdapterTimerMgr* pAdapter = NULL;
   CPDFDoc_Environment* pEnv = m_pEnvList.GetAt(0);