use "/" instead of path.sep in owners glob check
use "/" instead of path.sep in owners glob check

R=maruel@chromium.org
BUG=157022


Review URL: https://chromiumcodereview.appspot.com/11236018

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@163198 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

svn2github/chromium-depot-tools,svn2github/chromium-depot-tools,svn2github/chromium-depot-tools