GitLab

This reverts commit 6a7ccf89.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 560074 as the
culprit for flakes in the build cycles as shown on:
https://findit-for-me.appspot.com/waterfall/flake/flake-culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyQwsSDEZsYWtlQ3VscHJpdCIxY2hyb21pdW0vNmE3Y2NmODk4MTdlYzQ4MzBkZWNiYTg5OTBjYjRhNTc2MjE3M2M1Ngw

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.mac/Mac10.10%20Tests/32310

Sample Failed Step: headless_browsertests on Mac-10.10

Sample Flaky Test: HeadlessProtocolBrowserTest.VirtualTimeNoBlock404

Original change's description:
> Headless: port more tests to the new protocol harness.
> 
> Change-Id: I4746041f5ff8285e21322c99c897fb9e2e2da19c
> Reviewed-on: https://chromium-review.googlesource.com/1066700
> Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#560074}

Change-Id: I9e6bbed1371415f0f5c79538868c6d36a99ff8ac
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 844827
Reviewed-on: https://chromium-review.googlesource.com/1066745
Cr-Commit-Position: refs/heads/master@{#560152}