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This reverts commit 4f0531b4.

Reason for revert:Another change was speculatively reverted at the
same time, when the webgl_conformance_tests began passing again.
This change does not change behavior except on Windows, so shouldn't
be the cause of the webgl_conformance_tests failure/passing on 
chromeos.

Original change's description:
> Revert "Revert back to the default GPU when no renderers are using WebXR"
> 
> This reverts commit 0fb7ef15.
> 
> Reason for revert: Speculative revert
> May have broken webgl_conformance_tests on chromeos-amd64-generic-rel:
> https://ci.chromium.org/p/chromium/builders/ci/chromeos-amd64-generic-rel/45665
> 
> Original change's description:
> > Revert back to the default GPU when no renderers are using WebXR
> > 
> > The GPU process may have been restarted and initialized on a different
> > GPU than the default if the VR headset is not plugged into the default
> > GPU. Staying on this XR compatible GPU can drain battery a lot quicker.
> > When there are no longer any renderers using WebXR, this change reverts
> > reverts the GPU process back to the default GPU.
> > 
> > Bug: 1090951
> > Change-Id: Ibc5e7f709d2c82d5a6e8cbda08766d1d654951a3
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2321771
> > Commit-Queue: Patrick To <patrto@microsoft.com>
> > Reviewed-by: Alexander Cooper <alcooper@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#798950}
> 
> TBR=patrto@microsoft.com,alcooper@chromium.org
> 
> Change-Id: I14e44c4fe60cdde138ea281b8766ac113887aa99
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Bug: 1090951
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2359663
> Reviewed-by: Fergus Dall <sidereal@google.com>
> Commit-Queue: Fergus Dall <sidereal@google.com>
> Cr-Commit-Position: refs/heads/master@{#798984}

TBR=patrto@microsoft.com,sidereal@google.com,alcooper@chromium.org

# Not skipping CQ checks because this is a reland.

Bug: 1090951
Change-Id: Id5cf2e4c949b2d5b727047bdadb7fe021a535e1e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2363288Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Patrick To <patrto@microsoft.com>
Commit-Queue: Alexander Cooper <alcooper@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799742}