[webkit-dev] Removal of the Grid Layout runtime flag

[Javier Fernandez]

Hi,

The CSS Grid Layout feature is shipped and enabled by default since
Safari 10.1. It's also shipped by default in Chrome, Firefox and Edge.

Do we still need the 'cssGridLayoutEnabled' runtime flag ?
In my opinion it's safe to remove the flag and the conditional code we
have in the CSS parser and layout.

Thanks,

Javier