Convert FWL_ERR into an enum class.

xfa/fwl/theme/cfwl_listboxtp.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_listboxtp.h"
 
 #include "xfa/fwl/basewidget/ifwl_listbox.h"
 #include "xfa/fwl/core/cfwl_themebackground.h"
@@ skipping 48 matching lines @@
       } else if (pParams->m_dwStates == CFWL_PartState_Normal) {
         color = 0xFF0000FF;
       }
       FillSoildRect(pParams->m_pGraphics, color, &pParams->m_rtPart,
                     &pParams->m_matrix);
     }
     default: {}
   }
   return TRUE;
 }
-FWL_ERR CFWL_ListBoxTP::Initialize() {
+FWL_Error CFWL_ListBoxTP::Initialize() {
   InitTTO();
   return CFWL_WidgetTP::Initialize();
 }
-FWL_ERR CFWL_ListBoxTP::Finalize() {
+FWL_Error CFWL_ListBoxTP::Finalize() {
   FinalizeTTO();
   return CFWL_WidgetTP::Finalize();
 }
 void CFWL_ListBoxTP::DrawListBoxItem(CFX_Graphics* pGraphics,
                                      uint32_t dwStates,
                                      const CFX_RectF* prtItem,
                                      void* pData,
                                      CFX_Matrix* pMatrix) {
   if (dwStates & CFWL_PartState_Selected) {
     pGraphics->SaveGraphState();
@@ skipping 11 matching lines @@
 #endif
     pGraphics->FillPath(&path, FXFILL_WINDING, pMatrix);
     pGraphics->RestoreGraphState();
   }
   if (dwStates & CFWL_PartState_Focused) {
     if (pData) {
       DrawFocus(pGraphics, (CFX_RectF*)pData, pMatrix);
     }
   }
 }