GitLab

- Set is_resumable in the OfflineItem to true so that paused downloads
can be resumed.
- Fix deallocated memory access in the Abort workflow which was causing
the browser to crash.

Change-Id: I2369ffe517796c245b6d3351e4d90aa6b4a1510b
Reviewed-on: https://chromium-review.googlesource.com/1253624
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595443}