You don't need to poke around inside FileDescriptor manually.

We can help you with that.

Note also that getParcelFileDescriptorFD did no such thing. All its callers
were passing in a regular java.io.FileDescriptor and expecting the int. No
ParcelFileDescriptors involved.

Change-Id: Idc233626f20c092e719f152562601f406cc1b64a