Don't return empty vector from GetCounterValues
As later LayoutCounter unconditionally calls for front().
Also, the spec says a zero-valued counter should be created in such
case.
Fixed: 374064162
Change-Id: If9ddb8be1df81baeb4e6e30084c2a49ad6739f65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5938969
Reviewed-by: Morten Stenshorne mstensho@chromium.org
Commit-Queue: Daniil Sakhapov sakhapov@chromium.org
Cr-Commit-Position: refs/heads/main@{#1376363}