The correct test was the multi-context version.

BUG=angleproject:1541

This reverts commit d0614b85.

Change-Id: I4f4a9e3b1e0301eef34ce8c06cd649bff66fcdb1
Reviewed-on: https://chromium-review.googlesource.com/394216Reviewed-by: Jamie Madill <jmadill@chromium.org>