Fix incorrect comparison with bitmask.

Fix incorrect comparison with bitmask.

This may have caused the audio power save blocker to not be created
or released appropriately when tabs move in and out of the background.

BUG=367785
TEST=tab audio indicator works as expected.

Committed: https://crrev.com/2701185b84d9e8ef62068839620599b891fc1e1e
Cr-Commit-Position: refs/heads/master@{#310118}

[DaleCurtis, 2015-01-06 02:02:00]

dalecurtis@chromium.org changed reviewers:
+ nasko@chromium.org

[nasko, 2015-01-06 18:15:42]

LGTM

[DaleCurtis, 2015-01-06 18:34:15]

The CQ bit was checked by dalecurtis@chromium.org

[commit-bot: I haz the power, 2015-01-06 18:35:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/817143006/1

[commit-bot: I haz the power, 2015-01-06 19:53:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-06 19:53:51]

Patchset 1 (id:??) landed as
https://crrev.com/2701185b84d9e8ef62068839620599b891fc1e1e
Cr-Commit-Position: refs/heads/master@{#310118}