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This method only served to pause inline sessions from updating their
poses in VRB. Now that VRB has been removed we no longer need it.

Bug: 1017477
Change-Id: I1d93ce690550b5e8c282c4ceacb731b59799dc0e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2422708Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Reviewed-by: Klaus Weidner <klausw@chromium.org>
Reviewed-by: Chris Palmer <palmer@chromium.org>
Reviewed-by: Brandon Jones <bajones@chromium.org>
Reviewed-by: Alexander Cooper <alcooper@chromium.org>
Auto-Submit: Brandon Jones <bajones@chromium.org>
Commit-Queue: Brandon Jones <bajones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#810937}