Convert FWL_ERR into an enum class.

xfa/fxfa/app/xfa_ffpushbutton.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_ffpushbutton.h"
 
 #include "xfa/fwl/core/fwl_noteimp.h"
 #include "xfa/fwl/core/fwl_widgetmgrimp.h"
@@ skipping 186 matching lines @@
       }
     }
     if (pCapTextLayout) {
       pCapTextLayout->DrawString(pRenderDevice, mt, rtClip);
     }
   }
 }
 int32_t CXFA_FFPushButton::OnProcessMessage(CFWL_Message* pMessage) {
   return m_pOldDelegate->OnProcessMessage(pMessage);
 }
-FWL_ERR CXFA_FFPushButton::OnProcessEvent(CFWL_Event* pEvent) {
+FWL_Error CXFA_FFPushButton::OnProcessEvent(CFWL_Event* pEvent) {
   m_pOldDelegate->OnProcessEvent(pEvent);
   return CXFA_FFField::OnProcessEvent(pEvent);
 }
-FWL_ERR CXFA_FFPushButton::OnDrawWidget(CFX_Graphics* pGraphics,
-                                        const CFX_Matrix* pMatrix) {
+FWL_Error CXFA_FFPushButton::OnDrawWidget(CFX_Graphics* pGraphics,
+                                          const CFX_Matrix* pMatrix) {
   if (m_pNormalWidget->GetStylesEx() & XFA_FWL_PSBSTYLEEXT_HiliteInverted) {
     if ((m_pNormalWidget->GetStates() & FWL_STATE_PSB_Pressed) &&
         (m_pNormalWidget->GetStates() & FWL_STATE_PSB_Hovered)) {
       CFX_RectF rtFill;
       m_pNormalWidget->GetWidgetRect(rtFill);
       rtFill.left = rtFill.top = 0;
       FX_FLOAT fLineWith = GetLineWidth();
       rtFill.Deflate(fLineWith, fLineWith);
       CFX_Color cr(FXARGB_MAKE(128, 128, 255, 255));
       pGraphics->SetFillColor(&cr);
@@ skipping 12 matching lines @@
       pGraphics->SetLineWidth(fLineWidth);
       CFX_Path path;
       path.Create();
       CFX_RectF rect;
       m_pNormalWidget->GetWidgetRect(rect);
       path.AddRectangle(0, 0, rect.width, rect.height);
       pGraphics->StrokePath(&path, (CFX_Matrix*)pMatrix);
     }
   } else if (m_pNormalWidget->GetStylesEx() & XFA_FWL_PSBSTYLEEXT_HilitePush) {
   }
-  return FWL_ERR_Succeeded;
+  return FWL_Error::Succeeded;
 }