Cleanup widget edge related code

xfa/fwl/theme/cfwl_pushbuttontp.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_pushbuttontp.h"
 
 #include "xfa/fwl/cfwl_pushbutton.h"
 #include "xfa/fwl/cfwl_themebackground.h"
@@ skipping 13 matching lines @@
 bool CFWL_PushButtonTP::IsValidWidget(CFWL_Widget* pWidget) {
   return pWidget && pWidget->GetClassID() == FWL_Type::PushButton;
 }
 
 void CFWL_PushButtonTP::DrawBackground(CFWL_ThemeBackground* pParams) {
   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_RectF& rect = pParams->m_rtPart;
       FX_FLOAT fRight = rect.right();
       FX_FLOAT fBottom = rect.bottom();
       CFX_Path strokePath;
       strokePath.Create();
       strokePath.MoveTo(rect.left + PUSHBUTTON_SIZE_Corner, rect.top);
       strokePath.LineTo(fRight - PUSHBUTTON_SIZE_Corner, rect.top);
       strokePath.LineTo(fRight, rect.top + PUSHBUTTON_SIZE_Corner);
       strokePath.LineTo(fRight, fBottom - PUSHBUTTON_SIZE_Corner);
@@ skipping 88 matching lines @@
   if (dwStates & CFWL_PartState_Default) {
     color += 3;
   } else {
     if (dwStates & CFWL_PartState_Hovered)
       color += 2;
     if (dwStates & CFWL_PartState_Pressed)
       color += 1;
   }
   return color;
 }