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This reverts commit 01116522.

Reason for revert: suspected of causing
PointerLockBrowserTestWithOptions.UnadjustedMovement to be flaky

See bug: 1043985

Original change's description:
> Exo: Undo conflation of relative-pointer and pointer-constraints
> 
> 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/+/1992355
> Reviewed-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}

TBR=mukai@chromium.org,oshima@chromium.org,prabirmsp@chromium.org

Change-Id: I8581f298f099cb7a9a006a1b578f6345184da1d3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: b/124059008
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2012517Reviewed-by: Nina Satragno <nsatragno@chromium.org>
Commit-Queue: Nina Satragno <nsatragno@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733612}