pkg/unittest: fix TestCase.runningTime
pkg/unittest: fix TestCase.runningTime

issue 4437 has been fixed for a while
Review URL: https://codereview.chromium.org//12442005

git-svn-id: b889c0189f1adfea19efba192a3d7a5b889e4120@19522 260f80e4-7a28-3924-810f-c04153c831b5

greglittlefield-wf/test,apwilson/test,apwilson/test,kevmoo/test,grouma/test,iglherme/Guttiest,iglherme/Guttiest,kevmoo/test,kevmoo/test,Pacane/test,apwilson/test,d2m/test,grouma/test,greglittlefield-wf/test,d2m/test,grouma/test,iglherme/Guttiest,Pacane/test,d2m/test,greglittlefield-wf/test