Remove more unused widget styles

xfa/fwl/cfwl_widgetmgr.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_widgetmgr.h"
 
 #include <utility>
 
@@ skipping 312 matching lines @@
 
 CFWL_Widget* CFWL_WidgetMgr::NextTab(CFWL_Widget* parent,
                                      CFWL_Widget* focus,
                                      bool& bFind) {
   CFWL_WidgetMgr* pMgr = parent->GetOwnerApp()->GetWidgetMgr();
   CFWL_Widget* child = pMgr->GetFirstChildWidget(parent);
   while (child) {
     if (focus == child)
       bFind = true;
 
-    if ((child->GetStyles() & FWL_WGTSTYLE_TabStop) &&
-        (!focus || (focus != child && bFind))) {
-      return child;
-    }
     CFWL_Widget* bRet = NextTab(child, focus, bFind);
     if (bRet)
       return bRet;
 
     child = pMgr->GetNextSiblingWidget(child);
   }
   return nullptr;
 }
 
 int32_t CFWL_WidgetMgr::CountRadioButtonGroup(CFWL_Widget* pFirst) const {
@@ skipping 372 matching lines @@
       pWidget(widget),
       iRedrawCounter(0)
 #if (_FX_OS_ == _FX_WIN32_DESKTOP_) || (_FX_OS_ == _FX_WIN64_)
       ,
       bOutsideChanged(false)
 #endif
 {
 }
 
 CFWL_WidgetMgr::Item::~Item() {}