[Extensions Toolbar] Observe original profile for extension host notifications

[Extensions Toolbar] Observe original profile for extension host notifications

Extension host closed notifications are sent from the original profile (never
the incognito profile). Use the original profile when listening for these
notifications.

BUG=454320
Committed: https://crrev.com/8925821521cea9d27b31ada6b184f8d84d534ad1
Cr-Commit-Position: refs/heads/master@{#314360}

[Devlin, 2015-02-03 16:17:34]

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

[Finnur, 2015-02-03 16:27:59]

LGTM

[Devlin, 2015-02-03 17:42:40]

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

[commit-bot: I haz the power, 2015-02-03 17:43:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/898603002/1

[commit-bot: I haz the power, 2015-02-03 17:46:47]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-02-03 17:47:32]

Patchset 1 (id:??) landed as
https://crrev.com/8925821521cea9d27b31ada6b184f8d84d534ad1
Cr-Commit-Position: refs/heads/master@{#314360}