[webkit-dev] Removing the ENABLE(CSS_SCROLL_SNAP) flag

Recently, css-scroll-snap was enabled on all ports. The implementation has also been extended to be mostly platform-independent. Since all ports are compiling this code and it's a fairly basic CSS feature should we go ahead and remove the ENABLE(CSS_SCROLL_SNAP) build flag? I think this would greatly simplify the scrolling code. Thanks! --Martin