Convert WindowOpenDisposition to an enum class.

components/renderer_context_menu/render_view_context_menu_base.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/renderer_context_menu/render_view_context_menu_base.h"
 
 #include <algorithm>
 #include <utility>
 #include <vector>
 
@@ skipping 373 matching lines @@
     const GURL& url,
     const GURL& referring_url,
     WindowOpenDisposition disposition,
     ui::PageTransition transition,
     const std::string& extra_headers) {
   content::Referrer referrer = content::Referrer::SanitizeForRequest(
       url,
       content::Referrer(referring_url.GetAsReferrer(),
                         params_.referrer_policy));
 
-  if (params_.link_url == url && disposition != OFF_THE_RECORD)
+  if (params_.link_url == url &&
+      disposition != WindowOpenDisposition::OFF_THE_RECORD)
     params_.custom_context.link_followed = url;
 
   OpenURLParams open_url_params(url, referrer, disposition, transition, false);
   if (!extra_headers.empty())
     open_url_params.extra_headers = extra_headers;
 
   WebContents* new_contents = source_web_contents_->OpenURL(open_url_params);
   if (!new_contents)
     return;
 
   NotifyURLOpened(url, new_contents);
 }
 
 bool RenderViewContextMenuBase::IsCustomItemChecked(int id) const {
   return IsCustomItemCheckedInternal(params_.custom_items, id);
 }
 
 bool RenderViewContextMenuBase::IsCustomItemEnabled(int id) const {
   return IsCustomItemEnabledInternal(params_.custom_items, id);
 }