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This reverts commit 04ee981e.

Reason for revert: Breaking win-chrome
See: https://ci.chromium.org/p/chrome/builders/ci/win-chrome/15856

Original change's description:
> Enable "Immersive-AR" session for OpenXR runtime
>
> The OpenXR runtime on Windows supports both "opaque" (WMR VR devices) and "additive" (Hololens). This change simply turns on support for Immersive-AR session according to the WebXR AR-module spec. The majority of the change is to let the runtime to decide about the blend_mode and interaction_mode instead of the current guessing logic at at the renderer layer.
>
> Bug: 1069350, 944936
> Change-Id: Ie5f1b56857f9ca5357dbd1dde6585687773d0b56
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2432759
> Commit-Queue: Phu Le <phle@microsoft.com>
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Klaus Weidner <klausw@chromium.org>
> Reviewed-by: Alexander Cooper <alcooper@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#816352}

TBR=dcheng@chromium.org,bajones@chromium.org,rafael.cintron@microsoft.com,klausw@chromium.org,alcooper@chromium.org,phle@microsoft.com

Change-Id: I0882e685902eb584ee2e417369a16697d21d1dfa
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1069350
Bug: 944936
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2466997Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Commit-Queue: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816382}