Fix button state for dragged browser action buttons

Fix button state for dragged browser action buttons

Dragging a browser action off the toolbar results in the button staying in
"pressed" state. Fix it so that it returns to normal state.

BUG=428287
Committed: https://crrev.com/73b68e194fad6aa952f85b511c3e9a2b094064f5
Cr-Commit-Position: refs/heads/master@{#301962}

[Devlin, 2014-10-29 20:29:07]

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

[Devlin, 2014-10-29 20:29:08]

Peter, please take a quick look.

[Peter Kasting, 2014-10-29 20:31:07]

LGTM

[Devlin, 2014-10-29 21:24:06]

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

[commit-bot: I haz the power, 2014-10-29 21:27:28]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/690653003/1

[commit-bot: I haz the power, 2014-10-29 22:59:22]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-29 23:00:10]

Patchset 1 (id:??) landed as
https://crrev.com/73b68e194fad6aa952f85b511c3e9a2b094064f5
Cr-Commit-Position: refs/heads/master@{#301962}