Remove extra warning from enyo.bench() that's not needed now

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Remove warning message filter from phantomjs-test.js files

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com
Merge pull request #327 from enyojs/remove-perf-warning

Remove extra warning from enyo.bench() that's not needed now

Reviewed-By: Gray Norton (gray.norton@lge.com)