This was previously a method in dEQP only. Cleanup change only.

Bug: angleproject:3353
Change-Id: I9ac58ab52516f75efbb08bddb39466a40c07cbb8
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1613892
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>