Cleanup fwl_* classes and cfx_* classes in fwl.

xfa/fwl/core/ifwl_app.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/ifwl_app.h"
 
 #include "third_party/base/ptr_util.h"
 #include "xfa/fwl/core/cfwl_widgetmgr.h"
 #include "xfa/fwl/core/fwl_noteimp.h"
 #include "xfa/fwl/core/ifwl_widget.h"
 #include "xfa/fxfa/app/xfa_fwladapter.h"
 
 IFWL_App::IFWL_App(CXFA_FFApp* pAdapter)
     : m_pAdapterNative(pAdapter),
       m_pWidgetMgr(pdfium::MakeUnique<CFWL_WidgetMgr>(pAdapter)),
       m_pNoteDriver(pdfium::MakeUnique<CFWL_NoteDriver>()) {
   ASSERT(m_pAdapterNative);
 }
 
-IFWL_App::~IFWL_App() {
-  CFWL_ToolTipContainer::DeleteInstance();
-}
+IFWL_App::~IFWL_App() {}