Revert of Support multiple video decoders and encoders (patchset #14 id:260001 of...

Revert of Support multiple video decoders and encoders (patchset #14 id:260001 of https://codereview.chromium.org/826663002/)

Reason for revert:
This causes compile failure on "Linux ChromiumOS Ozone Builder Build"
http://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Ozone%20Builder/builds/9379

Original issue's description:
> Support multiple video decoders and encoders
>
> Some platforms have multiple video decoders and encoders.
> For decode and encoder, return the first succeed initialized VDA and VEA
> from all possible platforms. GetSupportedProfile return all possible profiles
> from all encoders.
>
> BUG=445016
> TEST=Tested on squawks. For decoder, make sure V4L2 initialization
> failed and VAAPI successed. For encoder, test on extension.
>
> Committed: https://crrev.com/fce5ccd14c3676b960917c095a050b7a76b15227
> Cr-Commit-Position: refs/heads/master@{#310232}

TBR=posciak@chromium.org,wuchengli@chromium.org,piman@chromium.org,henryhsu@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=445016

Review URL: https://codereview.chromium.org/832383004

Cr-Commit-Position: refs/heads/master@{#310238}