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This updates the WebIDL for the Shape Detection feature to match
https://github.com/WICG/shape-detection-api/pull/73.

Bug: 659138
Change-Id: I1b3acaeb1496b06a69100453c834e3f1f16d9c33
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1717229
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681008}