chromium: Fix startup of beta and dev channels.

Since version 34, ICU data files are now created separately and thus
need to be installed as well.

Closes #2016

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
(cherry picked from commit f117341ff2de4b95d223b41b36942e2f60ada2a3)
Signed-off-by: aszlig <aszlig@redmoonstudios.org>