Fix WPT typo (method name)

Change-Id: I01c5858048ee9261465e3daa15b16117f8cddeef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5314321


Reviewed-by: Joshua Hood <jdh@chromium.org>
Commit-Queue: Anton Maliev <amaliev@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1263449}