Convert comment block views to ES6.
Review Request #8178 — Created May 23, 2016 and discarded
This is step 1 of converting js/views/ to ES6. This change covers the comment
block views. Everything in here is straightforward.
Ran js-tests.
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There's a bunch of pending student projects that I'd like us to be able to merge in. Converting the world to ES6 (and this change in particular) is going to make a lot of this harder to merge. Let's not focus on ES6-ifying everything until we're further along in RB 3.0, especially with all the other tasks on our plate.