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This reverts commit 9e96a32b.

Reason for revert: Likely culprit of https://crbug.com/879469.

Original change's description:
> [media] Maintain DecoderSelector state throughout decoder selection.
> 
> This CL changes DecoderStream to maintain an instance of DecoderSelector
> continually. This enabled DecoderSelector to maintain
> DecryptingDemuxerStream state and the blacklist internally.
> 
> An immediate consequence is that DecoderSelector can now always try the
> full list of potential decoders each time that selection is triggered.
> This fixes the GPU->GPU changeType() transition, and provides a
> foundation to build GPU fallforward on top of.
> 
> Another consequence is that fallback can occur more than once for a
> stream. It is no longer possible to loop forever doing fallbacks, so this
> is a robustness improvement in addition to being a requirement for
> changeType().
> 
> Bug: 877673
> 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: I76d1bed1c914e1ec58a6653d7200fbb67f70971a
> Reviewed-on: https://chromium-review.googlesource.com/1188978
> Commit-Queue: Dan Sanders <sandersd@chromium.org>
> Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#587908}

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

Change-Id: I6836b3e04b56591289fd973a5e89092b70e923fe
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 877673
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/1199082Reviewed-by: Jan Wilken Dörrie <jdoerrie@chromium.org>
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587959}