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When it was first implemented, adding a relative-pointer-delegate would
also enable pointer capture (locking the pointer).

This change makes it so that the pointer can only be locked through the
pointer-constraints protocol.

Bug: b/124059008
Test: exo_unittests, manual testting using ArcPointerCaptureTestApp
Change-Id: Ied0f1c658aa713026e622f4ce26009e261d4f653
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1992355Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Prabir Pradhan <prabirmsp@chromium.org>
Auto-Submit: Prabir Pradhan <prabirmsp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733497}