Removes a vestigial code path.

This patch removes the getAncillaryFileDescriptors() call from the
ZygoteConnection class because the function setFileDescriptorsForSend(),
which sets the values retrieved by getAncillaryFileDescriptors(), is
never called on the socket.

Test: m & flash & boot & launch applications
Change-Id: I994379b2c2da7d0d1fb47907f00229bfc92328c3