telemetry: temporarily disable smoothness bench.

Temporarily disable smoothness benchmark on Linux and Android,
until crbug.com/313753 is fixed.

R=tonyg@chromium.org
BUG=313753
NOTRY=True

Review URL: https://codereview.chromium.org/56243005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232589 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232589