Make code compile with clang_use_chrome_plugin (part VI)

xfa/fwl/core/fwl_appimp.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "xfa/fwl/core/fwl_appimp.h"
 
 #include "xfa/fwl/core/cfwl_widgetmgr.h"
 #include "xfa/fwl/core/fwl_noteimp.h"
 #include "xfa/fwl/core/ifwl_app.h"
 #include "xfa/fwl/core/ifwl_widget.h"
 #include "xfa/fxfa/app/xfa_fwladapter.h"
 
 IFWL_App* IFWL_App::Create(CXFA_FFApp* pAdapter) {
   IFWL_App* pApp = new IFWL_App;
   pApp->SetImpl(new CFWL_AppImp(pApp, pAdapter));
   return pApp;
 }
 
+IFWL_App::IFWL_App() {}
+
+IFWL_App::~IFWL_App() {}
+
 void IFWL_App::Release() {}
 
 FWL_Error IFWL_App::Initialize() {
   return static_cast<CFWL_AppImp*>(GetImpl())->Initialize();
 }
 
 FWL_Error IFWL_App::Finalize() {
   return static_cast<CFWL_AppImp*>(GetImpl())->Finalize();
 }
 
@@ skipping 73 matching lines @@
 }
 
 static IFWL_App* g_theApp = nullptr;
 IFWL_App* FWL_GetApp() {
   return g_theApp;
 }
 
 void FWL_SetApp(IFWL_App* pApp) {
   g_theApp = pApp;
 }