net: Move dns_reloader.* into dns directory.

net: Move dns_reloader.* into dns directory.

It is DNS specific so it makes more sense to have it in net/dns rather
than in the generic net/base directory.

BUG=None
R=mmenke@chromium.org

Committed: https://crrev.com/47598f041e65b345ed00b62ba6fd9d0c69219bd3
Cr-Commit-Position: refs/heads/master@{#352967}

[mmenke, 2015-10-07 17:21:15]

Thanks for doing this!  LGTM

[tfarina, 2015-10-07 22:57:41]

The CQ bit was checked by tfarina@chromium.org

[commit-bot: I haz the power, 2015-10-07 23:00:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1392943003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1392943003/20001

[commit-bot: I haz the power, 2015-10-07 23:08:47]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-10-07 23:09:23]

Patchset 2 (id:??) landed as
https://crrev.com/47598f041e65b345ed00b62ba6fd9d0c69219bd3
Cr-Commit-Position: refs/heads/master@{#352967}