Remove backwards compatibility code.
Remove backwards compatibility code.

This code was necessary at first to update repos which did not run
the Sync step at all (e.g. when the commit queue first applied this
change to test it.) It is no longer needed.

BUG=none
TEST=Trybot run.

Change-Id: I6d7e7529c1b27bf505858ee3a73fafd9d20e731d
Reviewed-on: https://gerrit.chromium.org/gerrit/47872
Tested-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>
Reviewed-by: Peter Mayo <3d31fdaf44dc55bb1b4f50b19df9bc879177d37a@chromium.org>
Reviewed-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>
Commit-Queue: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>

chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite