Use ES6 let/const in processing-a-keyframes-argument.html; #7800
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Gradually we plan to move all these tests to ES6 (or at least the subset
supported by all UAs that are likely to implement this spec) so while we are
touching this file we update a few uses of 'var' to let/const.
MozReview-Commit-ID: 45OJyXmUzKu
Upstreamed from https://bugzilla.mozilla.org/show_bug.cgi?id=1402170 [ci skip]
This change is