[menu.js] Menu.menuItemSelector has to be set before decoration

[menu.js] Menu.menuItemSelector has to be set before decoration

In menu.js, the Menu.menuItemSelector is refereed in the decorator, so we need to set it before decoration

BUG=none
TEST=manually tested

Committed: https://crrev.com/652ac00b6cb87ed4194fb47e651f4551b9b56d84
Cr-Commit-Position: refs/heads/master@{#323889}

[yoshiki, 2015-04-03 13:30:35]

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

[yoshiki, 2015-04-03 14:08:30]

@dbeam, I found the bug that some properties for menu is assigned to non-menu
element. This patch fixes the bug. PTAL. Thnaks.

[Dan Beam, 2015-04-03 21:08:53]

lgtm

[yoshiki, 2015-04-06 01:26:29]

The CQ bit was checked by yoshiki@chromium.org

[commit-bot: I haz the power, 2015-04-06 01:26:38]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1053123003/20001

[commit-bot: I haz the power, 2015-04-06 02:16:12]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-04-06 02:17:01]

Patchset 2 (id:??) landed as
https://crrev.com/652ac00b6cb87ed4194fb47e651f4551b9b56d84
Cr-Commit-Position: refs/heads/master@{#323889}