Mark hackernews-comments.html for rebaseline again.

http://crrev.com/257273002 altered the rendering slightly, but it landed
before the rebaseline for http://crrev.com/249943002 had finished.

BUG=366136,365911,359788
TBR=pdr@chromium.org
NOTRY=true

Review URL: https://codereview.chromium.org/269623006

git-svn-id: svn://svn.chromium.org/blink/trunk@173093 bbb929c8-8fbe-4397-9dbb-9b2b20218538