timers: optimize callback call: bind -> arrow
timers: optimize callback call: bind -> arrow

ES6 arrow functions are much more efficient than `.bind()` functions.

PR-URL: https://github.com/nodejs/node/pull/4038
Reviewed-By: Rich Trott <28a7b6144c43947e3f532c033ff42c8a2ae08045@gmail.com>
Reviewed-By: Jeremiah Senkpiel <f1782d15e31ad502ea2c097c21cc235811d0cb7c@rocketmail.com>

dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node,dreamllq/node