Cleanup failed rebases in cros_build_lib.py.

If a rebase fails we should be nice and git rebase --abort so that we won't
leave the tree in a busted state.

BUG=chromium-os:16098
TEST=ran prebuilt test suite

Reviewed-on: http://gerrit.chromium.org/gerrit/2302
Reviewed-by: Chris Sosa <sosa@chromium.org>
Reviewed-by: Scott Zawalski <scottz@chromium.org>
Tested-by: David James <davidjames@chromium.org>
(cherry picked from commit cb2d970da51c6c9ae9123a4a47bad6252c608ca2)

Change-Id: Idd21c33a5b77bbc574958db4a1b94f6ed538e566
Reviewed-on: http://gerrit.chromium.org/gerrit/2316
Reviewed-by: Scott Zawalski <scottz@chromium.org>
Tested-by: David James <davidjames@chromium.org>
1 file changed