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This reverts commit 65c38f54.

Reason for revert: Causing DCHECK failures in VR instrumentation tests

Original change's description:
> GPU: Grow and shrink transfer buffer
> 
> Automatically grow the transfer buffer when it is full and shrink it
> when the full capacity is not being used. Allow choosing larger and
> smaller sizes than before.
> 
> Before we would only grow it when a single transfer request was larger
> than the whole buffer; requests smaller than the whole buffer would just
> block if the buffer was full. Also we would not ever shrink the buffer
> until someone called Free() manually.
> 
> Bug: 850271, 835353, 828363, 856347
> 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: If2f2235a1d5297c63663398b37e1e30791347a3e
> Reviewed-on: https://chromium-review.googlesource.com/1105505
> Commit-Queue: James Darpinian <jdarpinian@chromium.org>
> Reviewed-by: Antoine Labour <piman@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#572135}

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

Change-Id: I031b30234cdcfbd8a4e48c7ebb6fd23312ec10ed
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 850271, 835353, 828363, 856347, 859952
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/1124822Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572277}