desktop:fixed when new accounts and login, the dock display mode isnot
win7mode ,but the computer icon and trash icon still are in desktop

tower:https://tower.im/projects/1c0cd0c59ef941298c6e6b2ba6833b91/todos/d7ba92fbe4924a97a9c7fcfd493ec689/

Change-Id: I1ec16be9694270586f41926794a980550b6b9877