[Offline pages] Applying StoreState to track RequestQueueStore state

components/offline_pages/background/request_queue_in_memory_store.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/background/request_queue_in_memory_store.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "components/offline_pages/background/save_page_request.h"
@@ skipping 29 matching lines @@
   }
 
   base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
                                                 base::Bind(callback, status));
 }
 
 void RequestQueueInMemoryStore::UpdateRequests(
     const std::vector<SavePageRequest>& requests,
     const UpdateCallback& callback) {
   std::unique_ptr<UpdateRequestsResult> result(
-      new UpdateRequestsResult(StoreState::LOADED));
+      new UpdateRequestsResult(state()));
 
   ItemActionStatus status;
   for (const auto& request : requests) {
     RequestsMap::iterator iter = requests_.find(request.request_id());
     if (iter != requests_.end()) {
       status = ItemActionStatus::SUCCESS;
       iter->second = request;
       result->updated_items.push_back(request);
     } else {
       status = ItemActionStatus::NOT_FOUND;
@@ skipping 63 matching lines @@
       FROM_HERE,
       base::Bind(callback, results, base::Passed(std::move(requests))));
 }
 
 void RequestQueueInMemoryStore::Reset(const ResetCallback& callback) {
   requests_.clear();
   base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE,
                                                 base::Bind(callback, true));
 }
 
+StoreState RequestQueueInMemoryStore::state() const {
+  return StoreState::LOADED;
+}
+
 }  // namespace offline_pages