Make GetBestPageForOnlineURL async

components/offline_pages/stub_offline_page_model.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 "components/offline_pages/stub_offline_page_model.h"
 
 namespace offline_pages {
 
 StubOfflinePageModel::StubOfflinePageModel() {}
 StubOfflinePageModel::~StubOfflinePageModel() {}
@@ skipping 40 matching lines @@
 void StubOfflinePageModel::GetPageByOfflineURL(
     const GURL& offline_url,
     const SingleOfflinePageItemCallback& callback) {}
 const OfflinePageItem* StubOfflinePageModel::MaybeGetPageByOfflineURL(
     const GURL& offline_url) const {
   return nullptr;
 }
 void StubOfflinePageModel::GetPagesByOnlineURL(
     const GURL& online_url,
     const MultipleOfflinePageItemCallback& callback) {}
-void StubOfflinePageModel::GetBestPageForOnlineURL(
-    const GURL& online_url,
-    const SingleOfflinePageItemCallback callback) {}
 const OfflinePageItem* StubOfflinePageModel::MaybeGetBestPageForOnlineURL(
     const GURL& online_url) const {
   return nullptr;
 }
 void StubOfflinePageModel::CheckMetadataConsistency() {}
 void StubOfflinePageModel::ExpirePages(
     const std::vector<int64_t>& offline_ids,
     const base::Time& expiration_time,
     const base::Callback<void(bool)>& callback) {}
 ClientPolicyController* StubOfflinePageModel::GetPolicyController() {
   return nullptr;
 }
 bool StubOfflinePageModel::is_loaded() const {
   return true;
 }
 OfflineEventLogger* StubOfflinePageModel::GetLogger() {
   return nullptr;
 }
 }  // namespace offline_pages