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This reverts commit 7a59e081.

Reason for revert: https://crbug.com/853194

Original change's description:
> GPU: Don't flush when destroying transfer buffers.
>
> Destroying a transfer buffer now requires only an ordering barrier, not
> a full flush. This removes a source of unnecessary flushes and makes
> resizing the transfer buffer more efficient.
>
> Bug: 850271, 835353, 828363
> 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: I9bfe43c46c00f8e9fc29e6450da788f86e74bc52
> Reviewed-on: https://chromium-review.googlesource.com/1093580
> Reviewed-by: Robert Sesek <rsesek@chromium.org>
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
> Commit-Queue: James Darpinian <jdarpinian@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#567494}

TBR=sunnyps@chromium.org,rsesek@chromium.org,piman@chromium.org,jdarpinian@chromium.org

No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 850271, 835353, 828363
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: I7cd21d6cee9beca02ae28da8614a58e2f53dc848
Reviewed-on: https://chromium-review.googlesource.com/1102346
Commit-Queue: François Doray <fdoray@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567631}