Mark HID and USB device connections as non-persistent API resources.

Mark HID and USB device connections as non-persistent API resources.

Add an IsPersistent function to mark these resources as non-persistent
so that they will be cleaned up when the extension is suspended. The
default is persistent.

BUG=397234, 409759
Committed: https://crrev.com/8e6fae0b21680e56793dde769bdc36daca8880bb
Cr-Commit-Position: refs/heads/master@{#293626}

[Reilly Grant (use Gerrit), 2014-09-05 23:37:06]

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

[Ken Rockot(use gerrit already), 2014-09-05 23:40:32]

lgtm

[Reilly Grant (use Gerrit), 2014-09-05 23:59:33]

The CQ bit was checked by reillyg@chromium.org

[commit-bot: I haz the power, 2014-09-06 00:02:14]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/reillyg@chromium.org/548703003/1

[commit-bot: I haz the power, 2014-09-06 11:36:35]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-09-06 11:36:36]

Exceeded time limit waiting for builds to trigger.

[Reilly Grant (use Gerrit), 2014-09-06 17:03:54]

The CQ bit was checked by reillyg@chromium.org

[commit-bot: I haz the power, 2014-09-06 17:04:22]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/reillyg@chromium.org/548703003/1

[commit-bot: I haz the power, 2014-09-06 18:57:32]

Committed patchset #1 (id:1) as 0d36c21adfd31d4bcd3665e6b0aea338b7601872

[commit-bot: I haz the power, 2014-09-10 03:43:00]

Patchset 1 (id:??) landed as
https://crrev.com/8e6fae0b21680e56793dde769bdc36daca8880bb
Cr-Commit-Position: refs/heads/master@{#293626}