Don't set chromeos_official=False for trybots.
Don't set chromeos_official=False for trybots.

It looks like setting chromeos_official=False causes problems for the
hardware lab so we should revert it.

We can discuss at a future date whether it makes sense in general to set
chromeos_official=False for trybot builds. This topic is up for debate
as there are advantages to both approaches.

BUG=chromium:226120
TEST=Unit tests.

Change-Id: Ia2012c35128aa70c191c4ccf341d9ab287deee51
Reviewed-on: https://gerrit.chromium.org/gerrit/50039
Tested-by: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>
Reviewed-by: Dan Shi <ddf10325a07dcd5610d94b7b9f19da3abc09e645@chromium.org>
Commit-Queue: David James <f231dc574bbeb62604660cbc162d1b8642a0a3af@chromium.org>

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