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 OfflinePageModelTaskified::GetPagesByClientIds(
    const std::vector<ClientId>& client_ids,
    const MultipleOfflinePageItemCallback& callback) {
  auto task = GetPagesTask::CreateTaskMatchingClientIds(store_.get(), callback,
                                                        client_ids);
  task_queue_.AddTask(std::move(task));
}

void OfflinePageModelTaskified::GetPagesByClientIds(
    const std::vector<ClientId>& client_ids,
    const MultipleOfflinePageItemCallback& callback) {
  auto task = GetPagesTask::CreateTaskMatchingClientIds(store_.get(), callback,
                                                        client_ids);
  task_queue_.AddTask(std::move(task));
}
