Fix bug in browser action overflow container

Fix bug in browser action overflow container

Fix a bug where reording actions in the browser action overflow container can
cause them all to become visible.

BUG=414177
Committed: https://crrev.com/5345c6a40e86cda42fb3cd94a7af859f8f5bd9c8
Cr-Commit-Position: refs/heads/master@{#295108}

[Devlin, 2014-09-16 15:39:58]

rdevlin.cronin@chromium.org changed reviewers:
+ finnur@chromium.org

[Finnur, 2014-09-16 15:41:33]

LGTM

[Devlin, 2014-09-16 17:34:29]

The CQ bit was checked by rdevlin.cronin@chromium.org

[commit-bot: I haz the power, 2014-09-16 17:36:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/570403002/1

[commit-bot: I haz the power, 2014-09-16 18:34:07]

Committed patchset #1 (id:1) as 685157ce25898b41a363a933ec87f86fe05582b4

[commit-bot: I haz the power, 2014-09-16 18:36:03]

Patchset 1 (id:??) landed as
https://crrev.com/5345c6a40e86cda42fb3cd94a7af859f8f5bd9c8
Cr-Commit-Position: refs/heads/master@{#295108}