[Offline pages] Extracting callbacks from the Offline Page Model

components/offline_pages/offline_page_storage_manager_unittest.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/offline_page_storage_manager.h"
 
 #include <stdint.h>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/time/time.h"
 #include "components/offline_pages/client_policy_controller.h"
 #include "components/offline_pages/offline_page_item.h"
 #include "components/offline_pages/offline_page_model.h"
+#include "components/offline_pages/offline_page_types.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
-using DeletePageResult = offline_pages::OfflinePageModel::DeletePageResult;
-
 namespace offline_pages {
 
 namespace {
 const char kTestClientNamespace[] = "CLIENT_NAMESPACE";
 const GURL kTestUrl("http://example.com");
 const GURL kTestUrl2("http://other.page.com");
 const base::FilePath::CharType kFilePath[] = FILE_PATH_LITERAL("TEST_FILEPATH");
 const ClientId kTestClientId1(kTestClientNamespace, "1234");
 const ClientId kTestClientId2(kTestClientNamespace, "5678");
 const int64_t kTestFileSize = 876543LL;
@@ skipping 81 matching lines @@
 }
 
 TEST_F(OfflinePageStorageManagerTest, TestClearPages) {
   manager()->ClearPagesIfNeeded(base::Bind(
       &OfflinePageStorageManagerTest::OnPagesCleared, base::Unretained(this)));
   EXPECT_EQ(1, last_cleared_page_count());
   EXPECT_EQ(DeletePageResult::SUCCESS, last_delete_page_result());
 }
 
 }  // namespace offline_pages