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This reverts commit 2dbccf3e.

Reason for revert: Flaky crashes on bots.
external/wpt/webxr/xrStationaryReferenceSpace_floorlevel_updates.https.html
STDERR: #4 0x55ea51c21abc blink::XRSession::UpdatePresentationFrameState()

Bug: 1138047

Original change's description:
> WebXR: add recommendedViewportScale
>
> This uses an estimated GPU utilization ratio from ArCoreGl. The goal is
> to reduce the recommended viewport scale if the web app is unable to hit
> a target framerate due to excessive GPU work, but not do so if it's slow
> due to excessive JS computations or similar where reducing the viewport
> wouldn't help. This is opt-in, the scale only takes effect if the app
> calls view.requestViewportScale(view.recommendedViewportScale) followed
> by xrwebgllayer.getViewport(view).
>
> (Dynamic viewport scaling is only available if WebXRIncubations is
> enabled.)
>
> Spec link for context:
> https://immersive-web.github.io/webxr/#dom-xrview-recommendedviewportscale
>
> Change-Id: I0a8598d8bd03f27fd1d2cc6c542ff79812825d74
> Bug: 1133381
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2213113
> Commit-Queue: Klaus Weidner <klausw@chromium.org>
> Reviewed-by: Sam McNally <sammc@chromium.org>
> Reviewed-by: Piotr Bialecki <bialpio@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#816813}

TBR=sammc@chromium.org,klausw@chromium.org,bialpio@chromium.org,elalish@chromium.org

Change-Id: Ic34275b3c147c9428d7d57c1a876a91b172bc586
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1133381
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2469640Reviewed-by: Alan Cutter <alancutter@chromium.org>
Commit-Queue: Alan Cutter <alancutter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#816854}