b=1024901 revert TrackTicks range assertion to warning, unintentionally changed in b33b8af66151 r=roc

--HG--
extra : transplant_source : %D8%F8%C3%C2%C3%BF%29%F5%9C%3DiG%04%F9%86Gu%29%9A%8C
b=1026325 backout 169de60f0b1e from bug 821062 for shutdown hang

--HG--
extra : transplant_source : %92%9Cm8%AE%13%10U%06%FA%FA%15%08n%DF%5Do%18%87%E7