Cleanup widget edge related code

xfa/fwl/theme/cfwl_comboboxtp.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_comboboxtp.h"
 
 #include "xfa/fwl/cfwl_combobox.h"
 #include "xfa/fwl/cfwl_themebackground.h"
@@ skipping 18 matching lines @@
 
 void CFWL_ComboBoxTP::DrawBackground(CFWL_ThemeBackground* pParams) {
   if (!pParams)
     return;
 
   switch (pParams->m_iPart) {
     case CFWL_Part::Border: {
       DrawBorder(pParams->m_pGraphics, &pParams->m_rtPart, &pParams->m_matrix);
       break;
     }
-    case CFWL_Part::Edge: {
-      DrawEdge(pParams->m_pGraphics, pParams->m_pWidget->GetStyles(),
-               &pParams->m_rtPart, &pParams->m_matrix);
-      break;
-    }
     case CFWL_Part::Background: {
       CFX_Path path;
       path.Create();
       CFX_RectF& rect = pParams->m_rtPart;
       path.AddRectangle(rect.left, rect.top, rect.width, rect.height);
       FX_ARGB argb_color;
       switch (pParams->m_dwStates) {
         case CFWL_PartState_Selected:
           argb_color = FWLTHEME_COLOR_BKSelected;
           break;
@@ skipping 64 matching lines @@
     case CFWL_PartState_Disabled: {
       eState = FWLTHEME_STATE_Disable;
       break;
     }
     default:
       break;
   }
   DrawArrowBtn(pParams->m_pGraphics, &pParams->m_rtPart,
                FWLTHEME_DIRECTION_Down, eState, &pParams->m_matrix);
 }