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This reverts commit ff451c7b.

Reason for revert: Suspect of causing consistent failure of xr_browser_tests on Win10 Debug (NVIDIA) bot.

See 
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Win10%20Debug%20%28NVIDIA%29

First failure:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Win10%20Debug%20%28NVIDIA%29/10962



Original change's description:
> Enforce active lifetime of XRFrame objects
> 
> Deactivates XRFrame objects once the relevant callback returns, which
> causes future calls to the object methods to throw an exception.
> 
> Bug: 906842
> Change-Id: I192453f9f23b1b4d9a404daca352ab80a5393753
> Reviewed-on: https://chromium-review.googlesource.com/c/1343065
> Commit-Queue: Brandon Jones <bajones@chromium.org>
> Reviewed-by: Klaus Weidner <klausw@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#612887}

TBR=bajones@chromium.org,klausw@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 906842
Change-Id: I26eb3477ea875362a5f1e6fd0b67bbe4a3c2c4a5
Reviewed-on: https://chromium-review.googlesource.com/c/1356945Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Guido Urdaneta <guidou@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613039}