NaCl: Remove some inactive OWNERS

NaCl: Remove some inactive OWNERS

These people are no longer active in the project, so remove them from
OWNERS because they're not expected to do code reviews.

BUG=none
TEST=none

Committed: https://crrev.com/66122b33f13617f1328d7f888ba23296deb82e50
Cr-Commit-Position: refs/heads/master@{#325290}

[Mark Seaborn, 2015-04-15 18:39:27]

mseaborn@chromium.org changed reviewers:
+ ncbray@chromium.org

[Nick Bray (chromium), 2015-04-15 18:42:04]

LGTM

[Mark Seaborn, 2015-04-15 19:37:06]

The CQ bit was checked by mseaborn@chromium.org

[commit-bot: I haz the power, 2015-04-15 19:38:26]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1090673002/1

[commit-bot: I haz the power, 2015-04-15 20:04:20]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-15 20:06:00]

Patchset 1 (id:??) landed as
https://crrev.com/66122b33f13617f1328d7f888ba23296deb82e50
Cr-Commit-Position: refs/heads/master@{#325290}