Revert of Add correct support for videos with YUVJ420P color format, in the software...

Revert of Add correct support for videos with YUVJ420P color format, in the software conversion path. (https://codereview.chromium.org/242643011/)

Reason for revert:
Broke Linux Clang (dbg) bot.

http://build.chromium.org/p/chromium.linux/builders/Linux%20Clang%20%28dbg%29/builds/59028

http://build.chromium.org/p/chromium.linux/builders/Linux%20Clang%20%28dbg%29/builds/59028/steps/compile/logs/stdio

Original issue's description:
> Add correct support for videos with YUVJ420P color format, in the software conversion path.
>
> BUG=172898
>
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=268061

TBR=scherkus@chromium.org,hclam@chromium.org,rileya@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=172898

Review URL: https://codereview.chromium.org/263723004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@268064 0039d316-1c4b-4281-b951-d872f2087c98