am 75c95e9a: am 0eb7b697: Merge changes Ib63ab95a,I585b0610,Ia84da0b5 into honeycomb-mr1

* commit '75c95e9a6d5a91b660af62f72b5a3bac0f5c3811':
  UsbManager: Hide APIs not needed for USB host or accessory support.
  Remove MtpClient class from framework and public API
  UsbDevice: Move IO related methods to new UsbDeviceConnection class