[text-decorations] Fix a crash for ::first-line
This patch fixes a crash when text-decoration is applied to
::first-line.
Fixed: 345562934
Change-Id: If26564ca3dcb913236771ef4a634928485b68eca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5677308
Reviewed-by: Kent Tamura tkent@chromium.org
Auto-Submit: Koji Ishii kojii@chromium.org
Commit-Queue: Koji Ishii kojii@chromium.org
Cr-Commit-Position: refs/heads/main@{#1323270}