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::RunWhenLoaded(const base::Closure& task) {
  if (!is_loaded_) {
    delayed_tasks_.push_back(task);
    return;
  }

  base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, task);
}

void OfflinePageModelImpl::RunWhenLoaded(const base::Closure& task) {
  if (!is_loaded_) {
    delayed_tasks_.push_back(task);
    return;
  }

  base::ThreadTaskRunnerHandle::Get()->PostTask(FROM_HERE, task);
}
