Fix rare browser crash when closing the Origin Info Bubble.

Fix rare browser crash when closing the Origin Info Bubble.

BUG=468201
TEST=Follow the repro steps in the bug and ensure there's no crash.

Committed: https://crrev.com/edd17a1c50939a325590c6061c14da17690fb71e
Cr-Commit-Position: refs/heads/master@{#324102}

[palmer, 2015-04-07 18:48:36]

palmer@chromium.org changed reviewers:
+ rsesek@chromium.org

[palmer, 2015-04-07 18:48:36]

Does your fix LGTY? :)

[Robert Sesek, 2015-04-07 18:52:50]

LGTM

[palmer, 2015-04-07 18:57:29]

The CQ bit was checked by palmer@chromium.org

[commit-bot: I haz the power, 2015-04-07 18:58:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1069043002/1

[commit-bot: I haz the power, 2015-04-07 20:10:39]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-04-07 20:11:33]

Patchset 1 (id:??) landed as
https://crrev.com/edd17a1c50939a325590c6061c14da17690fb71e
Cr-Commit-Position: refs/heads/master@{#324102}