[NTP::Downloads] Do not show old downloads.

chrome/browser/ntp_snippets/content_suggestions_service_factory.cc

 // Copyright 2016 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/ntp_snippets/content_suggestions_service_factory.h"
 
 #include <utility>
 
 #include "base/feature_list.h"
 #include "base/files/file_path.h"
@@ skipping 103 matching lines @@
   service->RegisterProvider(std::move(provider));
 }
 
 void RegisterDownloadsProvider(OfflinePageModel* offline_page_model,
                                DownloadManager* download_manager,
                                DownloadHistory* download_history,
                                ContentSuggestionsService* service,
                                PrefService* pref_service) {
   auto provider = base::MakeUnique<DownloadSuggestionsProvider>(
       service, offline_page_model, download_manager, download_history,
-      pref_service);
+      pref_service, base::MakeUnique<base::DefaultClock>());
   service->RegisterProvider(std::move(provider));
 }
 #endif  // OS_ANDROID
 
 void RegisterBookmarkProvider(BookmarkModel* bookmark_model,
                               ContentSuggestionsService* service,
                               PrefService* pref_service) {
   auto provider = base::MakeUnique<BookmarkSuggestionsProvider>(
       service, bookmark_model, pref_service);
   service->RegisterProvider(std::move(provider));
@@ skipping 188 matching lines @@
                             language_model, pref_service, profile);
   }
 
   if (base::FeatureList::IsEnabled(
           ntp_snippets::kForeignSessionsSuggestionsFeature)) {
     RegisterForeignSessionsProvider(sync_service, service, pref_service);
   }
 
   return service;
 }