GitLab

Blink had a bug that sync XHR would timeout after 10 seconds. Add a
regression test to make sure the issue does not reoccur.

BUG=844268

Change-Id: I161e133582b719102a02349828cd4d9a08773785
Reviewed-on: https://chromium-review.googlesource.com/1070089
Commit-Queue: Adam Rice <ricea@chromium.org>
Reviewed-by: Tsuyoshi Horo <horo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561400}