Move //extensions/browser/api/socket/socket/OWNERS to parent directory.

Move //extensions/browser/api/socket/socket/OWNERS to parent directory.

Fix one more instance of an OWNERS file living in an empty subdirectory
of the directory it is supposed to be setting the owners of.

Committed: https://crrev.com/2b496b6d8eef2e8e0898c78ec0ba7ea2c9f62cd8
Cr-Commit-Position: refs/heads/master@{#329876}

[Reilly Grant (use Gerrit), 2015-05-14 17:03:01]

reillyg@chromium.org changed reviewers:
+ rpaquay@chromium.org

[Reilly Grant (use Gerrit), 2015-05-14 17:03:02]

Please take a look.

[rpaquay, 2015-05-14 17:39:01]

lgtm

[Reilly Grant (use Gerrit), 2015-05-14 17:49:48]

The CQ bit was checked by reillyg@chromium.org

[commit-bot: I haz the power, 2015-05-14 17:52:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1135143004/1

[commit-bot: I haz the power, 2015-05-14 17:57:23]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-05-14 17:58:09]

Patchset 1 (id:??) landed as
https://crrev.com/2b496b6d8eef2e8e0898c78ec0ba7ea2c9f62cd8
Cr-Commit-Position: refs/heads/master@{#329876}