Tighten NeedsRebaseline expectation for broken-ideograph-small-caps.html

This will silence the expected Lion crashes from the waterfall.

TBR=eae@chromium.org

Review URL: https://codereview.chromium.org/20518005

git-svn-id: svn://svn.chromium.org/blink/trunk@154950 bbb929c8-8fbe-4397-9dbb-9b2b20218538