[Offline pages] Refactor URL conversions from TabAndroid

components/offline_pages/offline_page_test_store.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/offline_pages/offline_page_test_store.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ skipping 23 matching lines @@
                          base::Bind(callback, load_status, GetAllPages()));
 }
 
 void OfflinePageTestStore::AddOrUpdateOfflinePage(
     const OfflinePageItem& offline_page,
     const UpdateCallback& callback) {
   last_saved_page_ = offline_page;
   bool result = scenario_ != TestScenario::WRITE_FAILED;
   if (result)
     offline_pages_[offline_page.bookmark_id] = offline_page;
-  task_runner_->PostTask(FROM_HERE, base::Bind(callback, result));
+  if (!callback.is_null())
+    task_runner_->PostTask(FROM_HERE, base::Bind(callback, result));
 }
 
 void OfflinePageTestStore::RemoveOfflinePages(
     const std::vector<int64>& bookmark_ids,
     const UpdateCallback& callback) {
   ASSERT_FALSE(bookmark_ids.empty());
   bool result = false;
   if (scenario_ != TestScenario::REMOVE_FAILED) {
     for (const auto& bookmark_id : bookmark_ids) {
       auto iter = offline_pages_.find(bookmark_id);
@@ skipping 22 matching lines @@
 }
 
 std::vector<OfflinePageItem> OfflinePageTestStore::GetAllPages() const {
   std::vector<OfflinePageItem> offline_pages;
   for (const auto& id_page_pair : offline_pages_)
     offline_pages.push_back(id_page_pair.second);
   return offline_pages;
 }
 
 }  // namespace offline_pages