Subversion usage is going away, tests get the kick first.

R=iannucci@chromium.org
BUG=475320

Review URL: https://codereview.chromium.org/1158043003

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@295411 0039d316-1c4b-4281-b951-d872f2087c98