time: Remove unnecessary call to Nanoseconds() in after().
time: Remove unnecessary call to Nanoseconds() in after().

R=golang-dev, bradfitz
CC=golang-dev
http://codereview.appspot.com/4528091

Committer: Brad Fitzpatrick <ae9783c0b0efc69cd85ab025ddd17aa44cdc4aa5@golang.org>

dsriram/golang,ssrl/go,gnanderson/go,gnanderson/go,tv42/old-go,gnanderson/go,pombredanne/go-deleteme,dsriram/golang,dsriram/golang,apparentlymart/golang,apparentlymart/golang,tv42/old-go,tv42/old-go,pombredanne/go-deleteme,apparentlymart/golang,dsriram/golang,apparentlymart/golang,dsriram/golang,ssrl/go,gnanderson/go,ssrl/go,gnanderson/go,tv42/old-go,pombredanne/go-deleteme,gnanderson/go,ssrl/go,ssrl/go,pombredanne/go-deleteme,dsriram/golang,apparentlymart/golang,ssrl/go,tv42/old-go,pombredanne/go-deleteme,dsriram/golang,pombredanne/go-deleteme,apparentlymart/golang,ssrl/go,gnanderson/go,apparentlymart/golang,tv42/old-go,pombredanne/go-deleteme,tv42/old-go