Bug 1732035 [wpt PR 30850] - Remove canvas the HitRegions feature, a=testonly

Bug 1732035 [wpt PR 30850] - Remove canvas the HitRegions feature, a=testonly

Automatic update from web-platform-tests
Remove canvas the HitRegions feature

It was proposed and implemented 3 years ago, but never fully shipped.
There's not enough developer interest to justify keeping this much
complexity in the code base.

Once this is gone we can also simplify calls in the MouseEventManager
crrev.com/c/3168812

Bug: 1249855
Change-Id: Iabd915be2c5f735ee007f863cbd4a2c39f1b192b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3166851
Reviewed-by: Aaron Krajeski <aaronhk@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Reviewed-by: Justin Novosad <junov@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Juanmi Huertas <juanmihd@chromium.org>
Commit-Queue: Aaron Krajeski <aaronhk@chromium.org>
Cr-Commit-Position: refs/heads/main@{#923124}

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wpt-commits: 3a4a2ff4665c09a220d4e0b3f840d7b889473b71
wpt-pr: 30850