This should fix the "halts mid-way" symptoms observed on linux.

R=agable@chromium.org, hinoka@chromium.org

Bug: 782543
Change-Id: Ia5254b7f8e73b5646f2782e36acc52b4772b095e
Reviewed-on: https://chromium-review.googlesource.com/865821Reviewed-by: Ryan Tseng <hinoka@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>