Convert WindowOpenDisposition to an enum class.

chrome/browser/ui/search/instant_search_prerenderer.cc

 // Copyright 2013 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 "chrome/browser/ui/search/instant_search_prerenderer.h"
 
 #include <utility>
 
 #include "chrome/browser/prerender/prerender_handle.h"
 #include "chrome/browser/prerender/prerender_manager.h"
@@ skipping 115 matching lines @@
 bool InstantSearchPrerenderer::UsePrerenderedPage(
     const GURL& url,
     chrome::NavigateParams* params) {
   base::string16 search_terms =
       search::ExtractSearchTermsFromURL(profile_, url);
   prerender::PrerenderManager* prerender_manager =
       prerender::PrerenderManagerFactory::GetForProfile(profile_);
   if (search_terms.empty() || !params->target_contents ||
       !prerender_contents() || !prerender_manager ||
       !QueryMatchesPrefetch(search_terms) ||
-      params->disposition != CURRENT_TAB) {
+      params->disposition != WindowOpenDisposition::CURRENT_TAB) {
     Cancel();
     return false;
   }
 
   // Do not use prerendered page for renderer initiated search requests.
   if (params->is_renderer_initiated &&
       ui::PageTransitionCoreTypeIs(params->transition,
                                    ui::PAGE_TRANSITION_LINK)) {
     Cancel();
     return false;
@@ skipping 35 matching lines @@
 content::WebContents* InstantSearchPrerenderer::prerender_contents() const {
   return (prerender_handle_ && prerender_handle_->contents()) ?
       prerender_handle_->contents()->prerender_contents() : NULL;
 }
 
 bool InstantSearchPrerenderer::QueryMatchesPrefetch(
     const base::string16& query) const {
   return search::ShouldReuseInstantSearchBasePage() ||
          last_instant_suggestion_.text == query;
 }