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This reverts commit 9ebbc362.

Reason for revert: Occasional doubled rAF on exiting presentation. Will re-land with additional fix included.

Original change's description:
> Fix rAF handoff on exiting WebVR presentation
> 
> If there's an outstanding presenting VSync request when presentation exits,
> it must be converted to a normal VSync request for magic window mode.
> 
> This fixes a regression introduced by crrev.com/c/817545.
> 
> BUG=794266
> 
> Change-Id: I93f0739facb702f68c29d8af7c77b669d6b54bda
> Reviewed-on: https://chromium-review.googlesource.com/822985
> Reviewed-by: Bill Orr <billorr@chromium.org>
> Reviewed-by: Michael Thiessen <mthiesse@chromium.org>
> Commit-Queue: Klaus Weidner <klausw@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#523612}

TBR=mthiesse@chromium.org,klausw@chromium.org,billorr@chromium.org

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

Bug: 794266
Change-Id: If0990fa84e7dce6edcd628a92e03792202d94865
Reviewed-on: https://chromium-review.googlesource.com/832926Reviewed-by: Klaus Weidner <klausw@chromium.org>
Commit-Queue: Klaus Weidner <klausw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524744}