Fix Geolocation high accuracy UseCounter for watchPosition

This change corrects the UseCounter for high-accuracy geolocation
tracking. The watchPosition API was incorrectly incrementing the
UseCounter for getCurrentPosition when high accuracy was enabled. This
CL changes it to correctly increment the UseCounter for watchPosition.

Change-Id: Ib974cfd939df8399f718533661537135d7fe6e0a
Bug: 454139574
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/7070238
Commit-Queue: Alvin Ji <alvinji@chromium.org>
Reviewed-by: Matt Reynolds <mattreynolds@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1533753}