Sheriff-o-matic: Fix inverted condition when persisting annotations

https://src.chromium.org/viewvc/blink?view=rev&revision=179897 was committed
with a broken test :(

BUG=399967
NOTRY=true
TBR=ojan@chromium.org

Review URL: https://codereview.chromium.org/459723002

git-svn-id: svn://svn.chromium.org/blink/trunk@179900 bbb929c8-8fbe-4397-9dbb-9b2b20218538