Convert border style defines to an enum class.

fpdfsdk/pdfwindow/PWL_ScrollBar.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 "fpdfsdk/pdfwindow/PWL_ScrollBar.h"
 
 #include "core/fxge/include/fx_ge.h"
 #include "fpdfsdk/pdfwindow/PWL_Utils.h"
@@ skipping 834 matching lines @@
       }
       SetScrollPos(fPos);
     } break;
   }
 }
 
 void CPWL_ScrollBar::CreateButtons(const PWL_CREATEPARAM& cp) {
   PWL_CREATEPARAM scp = cp;
   scp.pParentWnd = this;
   scp.dwBorderWidth = 2;
-  scp.nBorderStyle = PBS_BEVELED;
+  scp.nBorderStyle = BorderStyle::BEVELED;
 
   scp.dwFlags =
       PWS_VISIBLE | PWS_CHILD | PWS_BORDER | PWS_BACKGROUND | PWS_NOREFRESHCLIP;
 
   if (!m_pMinButton) {
     m_pMinButton = new CPWL_SBButton(m_sbType, PSBT_MIN);
     m_pMinButton->Create(scp);
   }
 
   if (!m_pMaxButton) {
@@ skipping 325 matching lines @@
   if (m_bMinOrMax)
     m_sData.SubSmall();
   else
     m_sData.AddSmall();
 
   if (FXSYS_memcmp(&m_sData, &sTemp, sizeof(PWL_SCROLL_PRIVATEDATA)) != 0) {
     MovePosButton(TRUE);
     NotifyScrollWindow();
   }
 }