Use css syntax stream parser in attr()
With recent modifications in attr() spec [0], is now
replaced with [1], so replaced css_attr_type with css syntax
stream parser.
Since is not part of , temporary remove tests
with dimension unit types until the spec issue [2] will be resolved.
[0] https://drafts.csswg.org/css-values-5/#attr-notation>
[1] https://drafts.csswg.org/css-values-5/#css-syntax
[2] w3c/csswg-drafts#11034
Bug: 369858674, 40320391
Change-Id: I865c8cf5c848339a9766be0a04c5dc3f94983878
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5975668
Reviewed-by: Anders Hartvoll Ruud andruud@chromium.org
Commit-Queue: Munira Tursunova moonira@google.com
Cr-Commit-Position: refs/heads/main@{#1376296}