Fix test expectation for complex-text-space-only-glyphpage.

r159214 fixed the failure. It now passes on all platforms.

BUG=305319
R=tkent@chromium.org

Review URL: https://codereview.chromium.org/26709004

git-svn-id: svn://svn.chromium.org/blink/trunk@159281 bbb929c8-8fbe-4397-9dbb-9b2b20218538