Fix expectations after autorebaseline.

I didn't expect the autorebaseline bot to remove a line entirely if the
'NeedsRebaseline' keyword was one of several expectations. Now I know.

TBR=ojan

Review URL: https://codereview.chromium.org/22914004

git-svn-id: svn://svn.chromium.org/blink/trunk@156018 bbb929c8-8fbe-4397-9dbb-9b2b20218538