Cleanup FWL Event and Message code.

xfa/fwl/core/cfwl_evtcheckstatechanged.cpp

Index: xfa/fwl/core/cfwl_evtcheckstatechanged.cpp
diff --git a/xfa/fwl/core/cfwl_evtcheckstatechanged.cpp b/xfa/fwl/core/cfwl_evtcheckstatechanged.cpp
deleted file mode 100644
index 53f7848fae939b8560b2b5ae589e8098565e6e6a..0000000000000000000000000000000000000000
--- a/xfa/fwl/core/cfwl_evtcheckstatechanged.cpp
+++ /dev/null
@@ -1,15 +0,0 @@
-// Copyright 2016 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/cfwl_evtcheckstatechanged.h"
-
-CFWL_EvtCheckStateChanged::CFWL_EvtCheckStateChanged() {}
-
-CFWL_EvtCheckStateChanged::~CFWL_EvtCheckStateChanged() {}
-
-CFWL_EventType CFWL_EvtCheckStateChanged::GetClassID() const {
-  return CFWL_EventType::CheckStateChanged;
-}