This means parsing the DEPS file all the time preemptively in case it's needed
for a From() reference. This could break certain checkout, we'll see.

R=dpranke@chromium.org
BUG=
TEST=


Review URL: http://codereview.chromium.org/8143022

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@104817 0039d316-1c4b-4281-b951-d872f2087c98