[css-scroll-snap-2] Rename snapchanging to scrollsnapchanging
Per the CSS working group resolution[1], snapchanging should be renamed
to scrollsnapchanging. This patch changes file contents. A follow-up patch
will change file names and directory names.
[1]w3c/csswg-drafts#9697 (comment)
Bug: 40286359, 338290502
Change-Id: If7d5c87a874a32f19f453a6b9ad3f10c167466eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5538788
Reviewed-by: Kevin Ellis kevers@chromium.org
Commit-Queue: David Awogbemila awogbemila@chromium.org
Reviewed-by: Robert Flack flackr@chromium.org
Cr-Commit-Position: refs/heads/main@{#1305040}