Move PrefRegistrySimple to use unique_ptr<Value>

components/ntp_tiles/popular_sites_impl.cc

 // Copyright 2015 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/ntp_tiles/popular_sites_impl.h"
 
 #include <stddef.h>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 314 matching lines @@
     user_prefs::PrefRegistrySyncable* user_prefs) {
   user_prefs->RegisterStringPref(ntp_tiles::prefs::kPopularSitesOverrideURL,
                                  std::string());
   user_prefs->RegisterStringPref(ntp_tiles::prefs::kPopularSitesOverrideCountry,
                                  std::string());
   user_prefs->RegisterStringPref(ntp_tiles::prefs::kPopularSitesOverrideVersion,
                                  std::string());
 
   user_prefs->RegisterInt64Pref(kPopularSitesLastDownloadPref, 0);
   user_prefs->RegisterStringPref(kPopularSitesURLPref, std::string());
-  user_prefs->RegisterListPref(kPopularSitesJsonPref,
-                               DefaultPopularSites().release());
+  user_prefs->RegisterListPref(kPopularSitesJsonPref, DefaultPopularSites());
 }
 
 void PopularSitesImpl::FetchPopularSites() {
   net::NetworkTrafficAnnotationTag traffic_annotation =
       net::DefineNetworkTrafficAnnotation("popular_sites_fetch", R"(
         semantics {
           sender: "Popular Sites New Tab Fetch"
           description:
             "Google Chrome may display a list of regionally-popular web sites "
             "on the New Tab Page. This service fetches the list of these sites."
@@ skipping 70 matching lines @@
     pending_url_ = GetPopularSitesURL(kPopularSitesDefaultCountryCode,
                                       kPopularSitesDefaultVersion);
     FetchPopularSites();
   } else {
     DLOG(WARNING) << "Download fallback site list failed";
     callback_.Run(false);
   }
 }
 
 }  // namespace ntp_tiles