Take 2 at adding --force to svn update and svn checkout.

Turns out that this was added in svn 1.5 and the mac bots
use svn 1.4.4.
Review URL: http://codereview.chromium.org/2623002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@48899 0039d316-1c4b-4281-b951-d872f2087c98
2 files changed