At some point, the scroll-animations-1 spec made animation-delay
into a shorthand expanding into animation-delay-start and -end,
however it was removed from the spec long ago.

This CL removes the animation-delay-start/end properties from Blink,
along with the "alternative" properties for 'animation-delay' and
'animation'. We'll just add the properties back if they reappear
in a specification later.

There is no behavior change: the animation-delay-start/end properties
never shipped.

Bug: 40896959
Change-Id: Idbbb78d14f34d2a4a1cb6599246bb9cbca703a52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5476471


Reviewed-by: Kevin Ellis <kevers@chromium.org>
Commit-Queue: Anders Hartvoll Ruud <andruud@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1292373}