[css-scroll-snap-2] Rename snapchanged to scrollsnapchange
Per the CSS working group resolution[1], snapchanged should be
renamed to scrollsnapchange. This patch changes the relevant file
names and directory names.
[1]w3c/csswg-drafts#9697 (comment)
Bug: 40273052, 338290502
Change-Id: I60132f4fe22ed5d5d37902b7f1570f7e96aba401
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5538749
Reviewed-by: Kevin Ellis kevers@chromium.org
Commit-Queue: David Awogbemila awogbemila@chromium.org
Cr-Commit-Position: refs/heads/main@{#1304613}