GitLab

Use ServiceWorkerContext::RunTask() to make sure that
ServiceWorkerContext* is kept alive while transitioning from
UI thread to IO thread.

Bug: 875376
Change-Id: Ib961931260b453e8a99828b8598d77c7821cff06
Reviewed-on: https://chromium-review.googlesource.com/1211971
Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589686}