am 093cf07f: am 9e8e4ea0: Merge changes Ib517e5e4,I93be7695,I49bf22a4 into honeycomb-mr1

* commit '093cf07f':
  Close USB dialogs if their corresponding accessory or device has disconnected
  USB: Add API and dialog for apps to request permissions for USB devices and accessories
  UsbService: Automatically use system apps by default if it is the only choice