Chrome Version: <From about:version: Google Chrome 50.0.2661.102>
Chrome OS Version: <From about:version: Platform Linux>
<b>Chrome OS Platform: <Make/model of computer running Chrome OS></b>
<b>Network info: <network, encryption type, router model (if known)></b>

Please specify Cr-* of the system to which this bug/feature applies (add
the label below).

Steps To Reproduce:
 for (let i = 0; i<10000; i++){console.log(typeof null == 'undefined')}

Expected Result:
10000 false
Actual Result:
4917 false
5083 true

How frequently does this problem reproduce? (Always, sometimes, hard to
reproduce?)
Always

What is the impact to the user, and is there a workaround? If so, what is
it?

Please provide any additional information below. Attach a screen shot or
log if possible.