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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}