Cross Reference: /external/chromium_org/ash/system/logout_button

`Name`	`Date`	`Size`
Up to higher level directory
`logout_button_observer.h`	20-Jun-2014	`762`
`logout_button_tray.cc`	20-Jun-2014	`5.2K`
`logout_button_tray.h`	20-Jun-2014	`1.9K`