Fix !important parsing for certain grid structures.
Bug: 340100643
Change-Id: I8821b806501b22b24789985f699a5a934f6b3c6c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5557302
Auto-Submit: Steinar H Gunderson sesse@chromium.org
Reviewed-by: Rune Lillesveen futhark@chromium.org
Commit-Queue: Steinar H Gunderson sesse@chromium.org
Cr-Commit-Position: refs/heads/main@{#1304372}