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This reverts commit 30e36bcc.

Reason for revert: Display compositor doesn't cause mid-frame flushes any more, so workaround isn't needed.

Original change's description:
> Bump WebGL stream to high-priority on Adreno 3xx.
> 
> WebGL has performance issues on Adreno 3xx when we switch contexts
> from/to the WebGL context mid-frame.
> 
> To avoid this issue, we can bump scheduler priority for the WebGL stream
> to high, avoiding most mid-frame interruptions. In local testing this
> (in combination with a backpressure fix) addresses known issues.
> 
> Bug: 879649, 835353
> Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
> Change-Id: I896456b29f3b80e3e443720b9ce444e6825c1c03
> Reviewed-on: https://chromium-review.googlesource.com/1200242
> Reviewed-by: Nasko Oskov <nasko@chromium.org>
> Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
> Commit-Queue: Eric Karl <ericrk@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#588287}

TBR=nasko@chromium.org,sunnyps@chromium.org,ericrk@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 879649, 835353
Change-Id: I0e0c75f5162789b457c2a4cdfa29dc8557972208
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/c/1311658
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Eric Karl <ericrk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604505}