Remove the number of runs from sheriff-o-matic.

This UI is to noisy. We need to do something more targetted
at the actual use case. See
https://code.google.com/p/chromium/issues/detail?id=405241#c7

NOTRY=true
BUG=405241

Review URL: https://codereview.chromium.org/488223004

git-svn-id: svn://svn.chromium.org/blink/trunk@180818 bbb929c8-8fbe-4397-9dbb-9b2b20218538