Revert "Allow support for msaa BGRA formats in GL."

This reverts commit dbc67b7bcafb29155798174b647657bf0f3ff827.

Reason for revert: breaking things

Original change's description:
> Allow support for msaa BGRA formats in GL.
>
> Bug: skia:13065
> Change-Id: I03e1ea815404cf92881125424cae0ae820644301
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/521961
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Greg Daniel <egdaniel@google.com>

Bug: skia:13065
Change-Id: Ic24c7d8873e92de9897e10f85fa10dc44bdd5061
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/523737
Auto-Submit: Greg Daniel <egdaniel@google.com>
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
1 file changed