Gardening: fast/text-autosizing/hackernews-comments.html fails

It was auto-rebaselined in Blink r173048 but still fails.
Marking as failure.

BUG=365911
TBR=pdr

Review URL: https://codereview.chromium.org/268633003

git-svn-id: svn://svn.chromium.org/blink/trunk@173063 bbb929c8-8fbe-4397-9dbb-9b2b20218538