Cleanup widget edge related code

xfa/fwl/cfwl_checkbox.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/cfwl_checkbox.h"
 
 #include <algorithm>
 #include <memory>
@@ skipping 54 matching lines @@
   if (!pGraphics)
     return;
   if (!m_pProperties->m_pThemeProvider)
     return;
 
   IFWL_ThemeProvider* pTheme = m_pProperties->m_pThemeProvider;
   if (HasBorder()) {
     DrawBorder(pGraphics, CFWL_Part::Border, m_pProperties->m_pThemeProvider,
                pMatrix);
   }
-  if (HasEdge())
-    DrawEdge(pGraphics, CFWL_Part::Edge, pTheme, pMatrix);
 
   int32_t dwStates = GetPartStates();
 
   CFWL_ThemeBackground param;
   param.m_pWidget = this;
   param.m_iPart = CFWL_Part::Background;
   param.m_dwStates = dwStates;
   param.m_pGraphics = pGraphics;
   if (pMatrix)
     param.m_matrix.Concat(*pMatrix);
@@ skipping 275 matching lines @@
 }
 
 void CFWL_CheckBox::OnKeyDown(CFWL_MessageKey* pMsg) {
   if (pMsg->m_dwKeyCode == FWL_VKEY_Tab)
     return;
   if (pMsg->m_dwKeyCode == FWL_VKEY_Return ||
       pMsg->m_dwKeyCode == FWL_VKEY_Space) {
     NextStates();
   }
 }