Remove auto value from anchor() function
See the CSSWG resolution here:
w3c/csswg-drafts#10312 (comment)
which says:
RESOLVED: Rename implicit to auto in position-anchor
RESOLVED: Drop the keyword from the anchor() function
The first part was taken care of in [1]. This CL takes care of
the second part.
[1] https://chromium-review.googlesource.com/c/chromium/src/+/5540275
Bug: 340206288
Change-Id: I33972e06104d061bb06232dac851877159b4fc92
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5542337
Reviewed-by: Anders Hartvoll Ruud andruud@chromium.org
Auto-Submit: Mason Freed masonf@chromium.org
Commit-Queue: Mason Freed masonf@chromium.org
Cr-Commit-Position: refs/heads/main@{#1302830}