This syntax isn't compatible with OSX.

Change-Id: I3ec2bc856843637c4e1e7afb96a93ff6ea8296da
Reviewed-on: https://chromium-review.googlesource.com/247660Reviewed-by: Geoff Lang <geofflang@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>