crosshair-sk: fix typos
crosshair-sk: fix typos

BUG=skia:
R=ethannichols@google.com
TBR=ethannichols@google.com

Review URL: https://codereview.chromium.org/1642893006

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot