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This reverts commit d8ec7dbd.

Reason for revert: This patch is suspicious to have caused failure at Dav1dVideoDecoderTest in media_unittests.

https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Linux%20CFI/12634

Original change's description:
> Reland: Add dav1d decoder and build configurations.
> 
> PS#1 is the original change, the latest PS disables assembly
> for MSAN and fixes up the .gitignore file.
> 
> -----------[Original Description Below]-----------
> We're planning to experiment with av1 decoders, so this change
> adds support for dav1d in Chromium.
> 
> This sets up the dav1d repo per modern 3rd party style: It's a
> read-only clone of dav1d's GitHub mirror with the build config
> and helper scripts living in the main Chromium src.git repo.
> Due to this configuration, no local patches can be made.
> 
> Two helper scripts have been added "generate_configs.py" and
> "generate_source.py". The former requires a few dependencies
> spelled out in the README.chromium. The latter works simply
> by globbing some source patterns into GN variables.
> 
> Thus far it seems all posix configurations (mac, linux, CrOS)
> can share the same config, so only support linux and windows
> in x86, x64 configurations has been added.
> 
> ARM support is not enabled yet since we haven't enabled libaom
> for ARM and similarly dav1d is lacking much of the SIMD code.
> 
> To wire everything up this also:
> - Adds a media::VideoDecoder based implementation and unit test.
> - Adds a disabled-by-default Dav1dVideoDecoder base::Feature.
> 
> TBR=jam,liberato,mmoroz
> 
> Bug: 924370, 928357
> Change-Id: I0e921599830d6e52019106e3ad42672873c94ece
> Reviewed-on: https://chromium-review.googlesource.com/c/1452782
> Reviewed-by: Max Moroz <mmoroz@chromium.org>
> Reviewed-by: Frank Liberato <liberato@chromium.org>
> Reviewed-by: John Abd-El-Malek <jam@chromium.org>
> Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
> Commit-Queue: John Abd-El-Malek <jam@chromium.org>
> Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#628921}

TBR=dalecurtis@chromium.org,jam@chromium.org,liberato@chromium.org,mmoroz@chromium.org

Change-Id: I08a969e9d221bf8a3b2128f83cd14080da8c7139
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 924370, 928357
Reviewed-on: https://chromium-review.googlesource.com/c/1454100Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629077}