Don't include WontFix counts in test counting statistics.

We explicitly don't care about the number of WontFix tests,
so don't show them total test counts in the graphs.
In rawResults view, you can still see the WontFix count,
but it's not included anywhere else.

NOTRY=true

Review URL: https://chromiumcodereview.appspot.com/21280002

git-svn-id: svn://svn.chromium.org/blink/trunk@155174 bbb929c8-8fbe-4397-9dbb-9b2b20218538