Makes SCM take the |file_list| as a parameter instead of getting it from |options|.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/8133032

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@104148 0039d316-1c4b-4281-b951-d872f2087c98