zabbix20: Update to new upstream version 2.0.8.

Upstream changes for version 2.0.7:

http://www.zabbix.com/rn2.0.7.php

Upstream changes for version 2.0.8:

http://www.zabbix.com/rn2.0.8.php

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
chromium: Update all channels to latest versions.

Version 29 has now made it into stable, the release announcement blog
post can be found here:

http://googlechromereleases.blogspot.de/2013/08/stable-channel-update.html

Overview of the updated channels:

stable: 28.0.1500.95 -> 29.0.1547.57
beta:   29.0.1547.49 -> 29.0.1547.57
dev:    30.0.1588.0  -> 30.0.1599.10 (userns patch updated)

All channels build fine and are tested (manually at the moment, until we
can run the test suite).

The userns patch for version 30.0.1599.0 from the dev channel didn't
apply anymore and is now rebased against 30.0.1599.10.

In addition, in version 30 the gyp flag for setting the sandbox path
isn't recognized anymore, so we patch it into the source directly.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>
chromium: Drop patches for version 28.

This drops the initial version of the user namespaces sandbox patch and
the fix for NSS 3.15, which is no longer needed because it was fixed
upstream.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>