Convert FWL_ERR into an enum class.

xfa/fxfa/app/xfa_ffcheckbutton.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/fxfa/app/xfa_ffcheckbutton.h"
 
 #include "xfa/fwl/core/cfwl_message.h"
 #include "xfa/fwl/core/fwl_noteimp.h"
@@ skipping 277 matching lines @@
 }
 FX_BOOL CXFA_FFCheckButton::UpdateFWLData() {
   if (!m_pNormalWidget) {
     return FALSE;
   }
   XFA_CHECKSTATE eState = m_pDataAcc->GetCheckState();
   SetFWLCheckState(eState);
   m_pNormalWidget->Update();
   return TRUE;
 }
-int32_t CXFA_FFCheckButton::OnProcessMessage(CFWL_Message* pMessage) {
-  return m_pOldDelegate->OnProcessMessage(pMessage);
+
+void CXFA_FFCheckButton::OnProcessMessage(CFWL_Message* pMessage) {
+  m_pOldDelegate->OnProcessMessage(pMessage);
 }
 
-FWL_ERR CXFA_FFCheckButton::OnProcessEvent(CFWL_Event* pEvent) {
+void CXFA_FFCheckButton::OnProcessEvent(CFWL_Event* pEvent) {
   CXFA_FFField::OnProcessEvent(pEvent);
   switch (pEvent->GetClassID()) {
     case CFWL_EventType::CheckStateChanged: {
       CXFA_EventParam eParam;
       eParam.m_eType = XFA_EVENT_Change;
       m_pDataAcc->GetValue(eParam.m_wsNewText, XFA_VALUEPICTURE_Raw);
       CXFA_WidgetAcc* pFFExclGroup = m_pDataAcc->GetExclGroup();
       if (ProcessCommittedData()) {
         eParam.m_pTarget = pFFExclGroup;
         if (pFFExclGroup) {
@@ skipping 10 matching lines @@
         eParam.m_pTarget = pFFExclGroup;
         pFFExclGroup->ProcessEvent(XFA_ATTRIBUTEENUM_Click, &eParam);
       }
       eParam.m_pTarget = m_pDataAcc;
       m_pDataAcc->ProcessEvent(XFA_ATTRIBUTEENUM_Click, &eParam);
       break;
     }
     default:
       break;
   }
-  return m_pOldDelegate->OnProcessEvent(pEvent);
+  m_pOldDelegate->OnProcessEvent(pEvent);
 }
 
-FWL_ERR CXFA_FFCheckButton::OnDrawWidget(CFX_Graphics* pGraphics,
-                                         const CFX_Matrix* pMatrix) {
-  return m_pOldDelegate->OnDrawWidget(pGraphics, pMatrix);
+void CXFA_FFCheckButton::OnDrawWidget(CFX_Graphics* pGraphics,
+                                      const CFX_Matrix* pMatrix) {
+  m_pOldDelegate->OnDrawWidget(pGraphics, pMatrix);
 }