Fix KillProcess so it doesn't report everything as a failure.
Fix KillProcess so it doesn't report everything as a failure.

BUG=none
TEST=UI tests on Mac should no longer all log that kills are failing.
Review URL: http://codereview.chromium.org/155297

git-svn-id: http://src.chromium.org/svn/trunk/src@20566 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: ec058cb966fc77bcae390d1b1b3a23457f205b2b
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser