GitLab

This reverts commit 15b15db4.

Reason for revert:

Findit (https://goo.gl/kROfz5) identified CL at revision 587871 as the
culprit for failures in the build cycles as shown on:
https://findit-for-me.appspot.com/waterfall/culprit?key=ag9zfmZpbmRpdC1mb3ItbWVyRAsSDVdmU3VzcGVjdGVkQ0wiMWNocm9taXVtLzE1YjE1ZGI0NzQ3YzNlOTI2MzgwZTJiZDg4MmNjN2E0OGUzNjRmZTUM

Sample Failed Build: https://ci.chromium.org/buildbot/chromium.gpu/GPU%20Linux%20Builder/128717

Sample Failed Step: compile

Original change's description:
> [Extensions] Remove an unused param from StartTestFromBackgroundPage.
> 
> The param was always passed with nullptr value, so remove it entirely.
> 
> Bug: None
> Test: None, test cleanup.
> Change-Id: If8cd3c4c7e0bd77fabbc545dcbd5fda69a9c0703
> Reviewed-on: https://chromium-review.googlesource.com/1196143
> Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
> Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#587871}

Change-Id: Iced35e86429f566d79c2ab7807d34c69b6456a35
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: None
Reviewed-on: https://chromium-review.googlesource.com/1198563
Cr-Commit-Position: refs/heads/master@{#587878}