merge_pr_46399

Fix a DCHECK if a block was seen in font-feature-settings.

We cannot Consume() in the streaming parser without first checking that
there's no block involved.

Fixed: 341349803
Change-Id: I0740fe7359f056a561dd1a82f1355b999537945a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5554250
Commit-Queue: Steinar H Gunderson sesse@chromium.org
Reviewed-by: Anders Hartvoll Ruud andruud@chromium.org
Cr-Commit-Position: refs/heads/main@{#1304312}