Add the method to check if offline archive is in internal dir

Bug: 758690
Change-Id: I8bb4283fc40a87fa7a87df2c7e513e2e16903290
Reviewed-on: https://chromium-review.googlesource.com/828049
Reviewed-by: Filip Gorski <fgorski@chromium.org>
Commit-Queue: Jian Li <jianli@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524232}
void OfflinePageModelImpl::DeletePagesByOfflineId(
    const std::vector<int64_t>& offline_ids,
    const DeletePageCallback& callback) {
  RunWhenLoaded(base::Bind(&OfflinePageModelImpl::DoDeletePagesByOfflineId,
                           weak_ptr_factory_.GetWeakPtr(), offline_ids,
                           callback));
}

void OfflinePageModelImpl::DeletePagesByOfflineId(
    const std::vector<int64_t>& offline_ids,
    const DeletePageCallback& callback) {
  RunWhenLoaded(base::Bind(&OfflinePageModelImpl::DoDeletePagesByOfflineId,
                           weak_ptr_factory_.GetWeakPtr(), offline_ids,
                           callback));
}
