Convert FWL_ERR into an enum class.

xfa/fwl/theme/cfwl_edittp.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/theme/cfwl_edittp.h"
 
 #include "xfa/fwl/basewidget/ifwl_edit.h"
 #include "xfa/fwl/core/cfwl_themebackground.h"
@@ skipping 59 matching lines @@
       CFX_Color crLine(cr);
       pParams->m_pGraphics->SetStrokeColor(&crLine);
       pParams->m_pGraphics->SetLineWidth(fWidth);
       pParams->m_pGraphics->StrokePath(pParams->m_pPath, &pParams->m_matrix);
       break;
     }
     default: { break; }
   }
   return TRUE;
 }
-FWL_ERR CFWL_EditTP::Initialize() {
+FWL_Error CFWL_EditTP::Initialize() {
   InitTTO();
   return CFWL_WidgetTP::Initialize();
 }
-FWL_ERR CFWL_EditTP::Finalize() {
+FWL_Error CFWL_EditTP::Finalize() {
   FinalizeTTO();
   return CFWL_WidgetTP::Finalize();
 }