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This reverts commit 4efc495c.

Reason for revert: Driver was fixed so this is no longer an issue.

Original change's description:
> webgl: gpu workaround to turn off MSAA
>
> PowerVR.*GX6250 gpu is producing artifacts when
> rendering with a context that has antialias set true.
>
> Bug: 1038671, b:148280161
> Change-Id: I79081f342bac2531e9d6d43a57939e3c5f8fc0e6
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2019939
> Reviewed-by: Kentaro Hara <haraken@chromium.org>
> Reviewed-by: Kenneth Russell <kbr@chromium.org>
> Commit-Queue: Kentaro Hara <haraken@chromium.org>
> Auto-Submit: Fritz Koenig <frkoenig@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#735217}

TBR=frkoenig@chromium.org,kbr@chromium.org,haraken@chromium.org

Bug: 1038671, b:148280161
Change-Id: I2e3ace6578fc90b26b5f180f388a6c80f56a0f63
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036400
Commit-Queue: Fritz Koenig <frkoenig@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738001}