The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/c16ce88057b6cc5117d9577ca510e8f41617e701

commit c16ce88057b6cc5117d9577ca510e8f41617e701
Author: Yafei Duan <romax@chromium.org>
Date: Wed Oct 11 19:23:58 2017

[Offline Pages] Reorganizing StoreUtils and remove ModelUtils.

Reorganizing OfflinePageStoreUtils and OfflinePageModelUtils:
1. Renamed OfflinePageStoreUtils to OfflineStoreUtils, indicating it's
   higher level and could be accessed from all Offline Pages projects.
2. Moved offline id generation to StoreUtils.
3. Moved ItemActionStatus translation back to the AddPageTask, which is
   the only class using the function.
4. Removed ModelUtils.
5. Changed to using namespaces rather than static methods in a class.
6. Updated usage of util methods, including background/, prefetching/
   and model/.

Bug:  770878 
Change-Id: I64d54211e0107e637cf3e9095d32f199fafc19a5
Reviewed-on: https://chromium-review.googlesource.com/701410
Reviewed-by: Dmitry Titov <dimich@chromium.org>
Reviewed-by: Filip Gorski <fgorski@chromium.org>
Reviewed-by: Carlos Knippschild <carlosk@chromium.org>
Commit-Queue: Yafei Duan <romax@chromium.org>
Cr-Commit-Position: refs/heads/master@{#508062}
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/BUILD.gn
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/background/request_coordinator.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/background/request_queue_store_sql.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/model/add_page_task.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/model/add_page_task_unittest.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/model/clear_storage_task.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/model/create_archive_task.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/model/delete_page_task.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/model/get_pages_task.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/model/mark_page_accessed_task.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/model/offline_page_item_generator.cc
[delete] https://crrev.com/6459d0ca6136551b1054b2e6c4316084beeaa436/components/offline_pages/core/model/offline_store_utils.cc
[delete] https://crrev.com/6459d0ca6136551b1054b2e6c4316084beeaa436/components/offline_pages/core/model/offline_store_utils.h
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/model/temporary_pages_consistency_check_task.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/offline_page_metadata_store_sql.cc
[add] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/offline_store_utils.cc
[add] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/offline_store_utils.h
[delete] https://crrev.com/6459d0ca6136551b1054b2e6c4316084beeaa436/components/offline_pages/core/offline_time_utils.cc
[delete] https://crrev.com/6459d0ca6136551b1054b2e6c4316084beeaa436/components/offline_pages/core/offline_time_utils.h
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/prefetch/add_unique_urls_task.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/prefetch/download_archives_task.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/prefetch/download_cleanup_task.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/prefetch/download_completed_task.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/prefetch/import_archives_task.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/prefetch/metrics_finalization_task.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/prefetch/prefetch_item.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/prefetch/stale_entry_finalizer_task.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/prefetch/store/prefetch_downloader_quota.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/prefetch/store/prefetch_store_test_util.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/prefetch/store/prefetch_store_unittest.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/prefetch/store/prefetch_store_utils.cc
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/prefetch/store/prefetch_store_utils.h
[modify] https://crrev.com/c16ce88057b6cc5117d9577ca510e8f41617e701/components/offline_pages/core/prefetch/task_test_base.cc