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This reverts commit e192695d.

Reason for revert: Buildbot failed.

Original change's description:
> [media] VdaVideoDecoder
> 
> This adds VdaVideoDecoder, an adapter that implements the media::VideoDecoder interface using a
> media::VideoDecodeAccelerator. VdaVideoDecoder expects to run in the GPU process, with access
> to a command buffer stub, as will be the case for decoders created by MojoVideoDecoder.
> 
> VdaVideoDecoder runs on the (mojo) IO thread as much as possible, but the VDA interface is
> inherently tied to the GPU thread.
> 
> 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:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
> Change-Id: I23f81c92b9ad72a5f0141c2eec2a528de1ffa9d3
> Bug: 522298
> Reviewed-on: https://chromium-review.googlesource.com/940336
> Reviewed-by: Xiaohan Wang <xhwang@chromium.org>
> Reviewed-by: Frank Liberato <liberato@chromium.org>
> Commit-Queue: Dan Sanders <sandersd@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#550471}

TBR=xhwang@chromium.org,sandersd@chromium.org,liberato@chromium.org

Change-Id: I706bf6a9b8b31d430b5facd0151e7e20dc73bcfb
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 522298, 832484
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:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Reviewed-on: https://chromium-review.googlesource.com/1011709Reviewed-by: Jianpeng Chao <chaopeng@chromium.org>
Commit-Queue: Jianpeng Chao <chaopeng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550480}