Conform selector used in focus manager of history to <cr-menu> element.

Conform selector used in focus manager of history to <cr-menu> element.

The issue was caused by a oversight of crrev.com/805713003.
As the menu was not treated as focus parent, 'focus' event was dispatched with the text-field as an target. This make the menu hidden just after the menu is shown.
This CL corrects the selector to make the menu focus parent.

BUG=444480
TEST=go through repro steps written in the issue

Committed: https://crrev.com/908f1466ebf48a6680b4ffede882c8bd64553965
Cr-Commit-Position: refs/heads/master@{#309610}

[fukino, 2014-12-22 10:26:00]

fukino@chromium.org changed reviewers:
+ dbeam@chromium.org

[fukino, 2014-12-22 10:26:00]

@dbeam: PTAL the CL?

I'm sorry I overlooked an occurrence of 'menu' in crrev.com/805713003.
I grepped again. I hope I found all occurrences this time...

[Dan Beam, 2014-12-22 19:22:30]

lgtm

[fukino, 2014-12-24 02:47:00]

The CQ bit was checked by fukino@chromium.org

[commit-bot: I haz the power, 2014-12-24 02:47:45]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/822663003/1

[commit-bot: I haz the power, 2014-12-24 03:34:02]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-12-24 03:34:51]

Patchset 1 (id:??) landed as
https://crrev.com/908f1466ebf48a6680b4ffede882c8bd64553965
Cr-Commit-Position: refs/heads/master@{#309610}