Merge change Ieb7a7d57 into eclair-mr2

* changes:
  Change the DropBoxManager API slightly (this is public, but not yet released) -- take a File instead of a ParcelFileDescriptor (gets opened internally) -- that way the caller doesn't have to worry about closing their PFD and so on. (Pretty much 100% of the time the caller will be uploading a file, anyway.)