Add the VERSION file to the snapshot

We should rely on this in order to expose the chromium version
in our user agent.
This should be added with later snapshots through the script, but this is just
so that our current snapshot supports it already.

Change-Id: I78c429ca21a4f4146303bbe6e471bcd8588236b7
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>