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Now that WebXR spec issue 664 has been resolved with the decision to
follow the Gamepad spec convention of using -1 for up and 1 for down for
the y axis values, remove/update related TODO comments to reflect this.

Bug: 966060
Change-Id: I3694631c35d3ad2e0990c132f2936f8ae1db1ee7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1717576
Commit-Queue: Jacob DeWitt <jacde@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681119}