Use check_call(), not check_output()
Use check_call(), not check_output()

There is user interaction when the svn credential isn't cached. (Duh)

TBR=dpranke@chromium.org
BUG=
TEST=


Review URL: http://codereview.chromium.org/7864007

git-svn-id: bd64dd6fa6f3f0ed0c0666d1018379882b742947@100462 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

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