bug 673224 - Change the various PR_*SEC_PER_*SEC constants to be signed, so working with times prior to the epoch is not as painful. Patch by Boris Zbarsky <bzbarsky@mit.edu>, r=wtc
bug 673224 - Change the various PR_*SEC_PER_*SEC constants to be signed, so working with times prior to the epoch is not as painful. Patch by Boris Zbarsky <bzbarsky@mit.edu>, r=wtc

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