Move the message definitions to their own files.

xfa/fwl/core/ifwl_edit.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_edit.h"
 
 #include <algorithm>
 #include <memory>
 #include <vector>
 
 #include "third_party/base/ptr_util.h"
 #include "third_party/base/stl_util.h"
 #include "xfa/fde/cfde_txtedtengine.h"
 #include "xfa/fde/fde_gedevice.h"
 #include "xfa/fde/fde_render.h"
 #include "xfa/fde/ifde_txtedtpage.h"
 #include "xfa/fgas/font/fgas_gefont.h"
-#include "xfa/fwl/core/cfwl_message.h"
+#include "xfa/fwl/core/cfwl_msgkey.h"
+#include "xfa/fwl/core/cfwl_msgmouse.h"
 #include "xfa/fwl/core/cfwl_themebackground.h"
 #include "xfa/fwl/core/cfwl_themepart.h"
 #include "xfa/fwl/core/cfwl_widgetmgr.h"
 #include "xfa/fwl/core/ifwl_app.h"
 #include "xfa/fwl/core/ifwl_caret.h"
 #include "xfa/fwl/core/ifwl_themeprovider.h"
 #include "xfa/fxfa/xfa_ffdoc.h"
 #include "xfa/fxfa/xfa_ffwidget.h"
 #include "xfa/fxgraphics/cfx_path.h"
 
@@ skipping 1684 matching lines @@
   UpdateOffset(pScrollBar, fPos - iCurPos);
   UpdateCaret();
 
   CFX_RectF rect;
   GetWidgetRect(rect);
   CFX_RectF rtInvalidate;
   rtInvalidate.Set(0, 0, rect.width + 2, rect.height + 2);
   Repaint(&rtInvalidate);
   return true;
 }