Set minimum OS X version to 10.5.x in DevicePermissionPrompt.xib.

Set minimum OS X version to 10.5.x in DevicePermissionPrompt.xib.

This resolves a number of compile-time warnings about features that
are not available in versions prior to 10.5.

BUG=427654
Committed: https://crrev.com/b538eb3bfd9a299885d589ca85809aa31587646e
Cr-Commit-Position: refs/heads/master@{#301584}

[Reilly Grant (use Gerrit), 2014-10-28 00:40:51]

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

[Avi (use Gerrit), 2014-10-28 02:00:06]

lgtm

[Reilly Grant (use Gerrit), 2014-10-28 02:23:23]

The CQ bit was checked by reillyg@chromium.org

[commit-bot: I haz the power, 2014-10-28 02:25:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/678763008/1

[commit-bot: I haz the power, 2014-10-28 07:08:40]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-28 07:09:27]

Patchset 1 (id:??) landed as
https://crrev.com/b538eb3bfd9a299885d589ca85809aa31587646e
Cr-Commit-Position: refs/heads/master@{#301584}