Bug 550463: Back out the previous checkin because the realpath extension is added in Mac OS X 10.6 and is not in Mac OS X 10.5.
Bug 550463: Back out the previous checkin because the realpath extension
is added in Mac OS X 10.6 and is not in Mac OS X 10.5.

makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub