Remove unused FWL methods

xfa/fwl/core/fwl_widgetmgrimp.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/core/fwl_widgetmgrimp.h"
 
 #include "xfa/fwl/core/cfwl_message.h"
 #include "xfa/fwl/core/fwl_appimp.h"
@@ skipping 989 matching lines @@
     CFX_RectF temp(m_pWidgetMgr->m_rtScreen);
     temp.Deflate(50, 50);
     if (!temp.Contains(r)) {
       return FALSE;
     }
     pItem->bOutsideChanged = FALSE;
   }
 #endif
   return pItem->iRedrawCounter == 0;
 }
-FX_BOOL FWL_WidgetIsChild(IFWL_Widget* parent, IFWL_Widget* find) {
-  if (!find) {
-    return FALSE;
-  }
-  IFWL_Widget* child =
-      FWL_GetWidgetMgr()->GetWidget(parent, FWL_WGTRELATION_FirstChild);
-  while (child) {
-    if (child == find) {
-      return TRUE;
-    }
-    if (FWL_WidgetIsChild(child, find)) {
-      return TRUE;
-    }
-    child = FWL_GetWidgetMgr()->GetWidget(child, FWL_WGTRELATION_NextSibling);
-  }
-  return FALSE;
-}