Use the BrowserActionsContainer for new extension bubbles in the toolbar redesign

Use the BrowserActionsContainer for new extension bubbles in the toolbar redesign

When using the extension toolbar redesign, we should use the
BrowserActionsContainer for any "new extension" bubbles, as
all extensions will have an icon there. Use this in lieu of
the location bar or a page action.

BUG=422117
Committed: https://crrev.com/087042288f97653f789377de7fbad24893e418fd
Cr-Commit-Position: refs/heads/master@{#299115}

[Devlin, 2014-10-09 23:26:14]

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

[Devlin, 2014-10-09 23:27:47]

Just a first step to make it work while we figure out other odds and ends (I'm
wondering if whatever we do for "desire to act" will affect how we handle this
more thoroughly).

[Finnur, 2014-10-10 08:57:46]

LGTM

[Devlin, 2014-10-10 14:47:37]

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

[commit-bot: I haz the power, 2014-10-10 14:48:01]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/648553002/1

[commit-bot: I haz the power, 2014-10-10 15:15:12]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-10 15:15:52]

Patchset 1 (id:??) landed as
https://crrev.com/087042288f97653f789377de7fbad24893e418fd
Cr-Commit-Position: refs/heads/master@{#299115}