Upgrade hook v44 fixes

- do test for chromium/src before fixing the checkout.
- don't switch manifests for minilayout users.

BUG=chromium-os:32963
TEST=locally

Change-Id: I1d0cbfc9f4f03d85b34810cdb98d99a7a21d8adf
Reviewed-on: https://gerrit.chromium.org/gerrit/28842
Reviewed-by: David James <davidjames@chromium.org>
Tested-by: Ryan Cui <rcui@chromium.org>
Commit-Ready: Ryan Cui <rcui@chromium.org>
1 file changed