Cleanup widget edge related code

xfa/fwl/cfwl_pushbutton.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_pushbutton.h"
 
 #include <memory>
 #include <utility>
@@ skipping 50 matching lines @@
                                  const CFX_Matrix* pMatrix) {
   if (!pGraphics)
     return;
   if (!m_pProperties->m_pThemeProvider)
     return;
 
   if (HasBorder()) {
     DrawBorder(pGraphics, CFWL_Part::Border, m_pProperties->m_pThemeProvider,
                pMatrix);
   }
-  if (HasEdge()) {
-    DrawEdge(pGraphics, CFWL_Part::Edge, m_pProperties->m_pThemeProvider,
-             pMatrix);
-  }
   DrawBkground(pGraphics, m_pProperties->m_pThemeProvider, pMatrix);
 }
 
 void CFWL_PushButton::DrawBkground(CFX_Graphics* pGraphics,
                                    IFWL_ThemeProvider* pTheme,
                                    const CFX_Matrix* pMatrix) {
   CFWL_ThemeBackground param;
   param.m_pWidget = this;
   param.m_iPart = CFWL_Part::Background;
   param.m_dwStates = GetPartStates();
@@ skipping 154 matching lines @@
   if (pMsg->m_dwKeyCode != FWL_VKEY_Return)
     return;
 
   CFWL_EventMouse wmMouse(this);
   wmMouse.m_dwCmd = FWL_MouseCommand::LeftButtonUp;
   DispatchEvent(&wmMouse);
 
   CFWL_Event wmClick(CFWL_Event::Type::Click, this);
   DispatchEvent(&wmClick);
 }