Revert 231233 "Telemetry: run media.tough_video_cases using WPR"

> Telemetry: run media.tough_video_cases using WPR
> 
> BUG=311713
> 
> Review URL: https://codereview.chromium.org/45453004

TBR=shadi@chromium.org

Review URL: https://codereview.chromium.org/48593004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@231342 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 231342