UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36

Steps to reproduce the problem:
1. Consider the following structure: a wrapper with four children:
```
<article>
    <section>dummy</section>
    <section>dummy</section>
    <section>dummy</section>
    <section>dummy</section>
</article>
```

2. Set `display: grid` on the wrapper and try using a `calc()` value inside the `repeat()` function in the value of the `grid` property. For example:

```
grid: repeat(calc(4/2), 1fr)/ repeat(2, 1fr);
/* or */
grid: repeat(calc(1*2), 1fr)/ repeat(2, 1fr)
```

Live test https://codepen.io/thebabydino/pen/VBOZXM

What is the expected behavior?
*Expected result*: a 2x2 grid in both cases. The second one (multiplication inside `calc()`) is pretty straightforward and works as expected in Chrome and Firefox, while the first one (division) should work, as per the Values 4 spec https://drafts.csswg.org/css-values-4/#calc-type-checking (no browser has yet caught up with this) - see also https://github.com/w3c/csswg-drafts/issues/2337

What went wrong?
*Actual result*: the first case (`calc()` with division inside `repeat()`) doesn't work.

Did this work before? No 

Does this work in other browsers? No
 Firefox (behaves the same as Chrome) 
https://bugzilla.mozilla.org/show_bug.cgi?id=1440251

Edge (`calc()` doesn't work at all in places such as inside `repeat()`) https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/18675657/

Chrome version: 68.0.3440.106  Channel: stable
OS Version: 10.0
Flash Version: