Use USE_UDEV instead of OS_LINUX when trying to use Udev functionality

Use USE_UDEV instead of OS_LINUX when trying to use Udev functionality

Fixes the Ozone builder where udev isn't available.

BUG=none

Committed: https://crrev.com/385034b44fb4f96b0258048955a927cc6f1c0cfd
Cr-Commit-Position: refs/heads/master@{#296866}

[dnicoara, 2014-09-25 23:27:33]

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

[dnicoara, 2014-09-25 23:27:34]

PTAL, this is a followup to https://codereview.chromium.org/601073002/ to fix
the Ozone ECS builder

[Reilly Grant (use Gerrit), 2014-09-26 00:34:59]

lgtm

[dnicoara, 2014-09-26 02:46:41]

The CQ bit was checked by dnicoara@chromium.org

[commit-bot: I haz the power, 2014-09-26 02:48:05]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/604143002/1

[commit-bot: I haz the power, 2014-09-26 02:52:49]

Committed patchset #1 (id:1) as 8da6db38e49a580f1a1420358a6051b8a526544c

[commit-bot: I haz the power, 2014-09-26 02:53:33]

Patchset 1 (id:??) landed as
https://crrev.com/385034b44fb4f96b0258048955a927cc6f1c0cfd
Cr-Commit-Position: refs/heads/master@{#296866}