This reverts commit ad194995.

Reason for revert: broke GPU optional bots since the revert of its previous CL

Original change's description:
> Disable broken tests on Fuchsia
> 
> This disables tests that do not work on Fuchsia. Most of them are related
> to cube maps which currently crash inside the intel driver.
> 
> BUG=angleproject:2475, angleproject:3145, angleproject:3081
> TEST=angle_end2end_tests on Fuchsia
> 
> Change-Id: Ifc0be390c6d5c43a756e1afb6ced9e3bd5b6986e
> Reviewed-on: https://chromium-review.googlesource.com/c/1446497
> Commit-Queue: Michael Spang <spang@chromium.org>
> Reviewed-by: Geoff Lang <geofflang@chromium.org>

TBR=spang@chromium.org,geofflang@chromium.org,jmadill@chromium.org

Change-Id: Id1861ee94b89020bcd64dd8e7e52588b76830783
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: angleproject:2475, angleproject:3145, angleproject:3081
Reviewed-on: https://chromium-review.googlesource.com/c/1465881Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Zhenyao Mo <zmo@chromium.org>