This reduces the likehood of conflict with local server and makes possible to
run this check two times in parallel.

R=dpranke@chromium.org
TEST=moar unit tests
BUG=none

Review URL: http://codereview.chromium.org/6725042

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@79281 0039d316-1c4b-4281-b951-d872f2087c98