Cleanup widget edge related code

xfa/fwl/theme/cfwl_datetimepickertp.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_datetimepickertp.h"
 
 #include "xfa/fwl/cfwl_datetimepicker.h"
 #include "xfa/fwl/cfwl_themebackground.h"
 
 CFWL_DateTimePickerTP::CFWL_DateTimePickerTP() {}
 
 CFWL_DateTimePickerTP::~CFWL_DateTimePickerTP() {}
 
 bool CFWL_DateTimePickerTP::IsValidWidget(CFWL_Widget* pWidget) {
   return pWidget && pWidget->GetClassID() == FWL_Type::DateTimePicker;
 }
 
 void CFWL_DateTimePickerTP::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::DropDownButton: {
       DrawDropDownButton(pParams, &pParams->m_matrix);
       break;
     }
     default:
       break;
   }
 }
 
 void CFWL_DateTimePickerTP::DrawDropDownButton(CFWL_ThemeBackground* pParams,
@@ skipping 18 matching lines @@
       eState = FWLTHEME_STATE_Disable;
       break;
     }
     default:
       break;
   }
   DrawArrowBtn(pParams->m_pGraphics, &pParams->m_rtPart,
                FWLTHEME_DIRECTION_Down, eState, pMatrix);
 }