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OzonePlatform members are intended to be leaked on browser shutdown,
so any FIDL channels contained by it (directly or indirectly) will
encounter connection errors on browser shutdown.

This CL causes some Ozone Platform objects, and their constituent
FIDL client objects, to be torn down as part of the normal browser
shutdown procedure.

Also fixes another shutdown breaking issue because the
FocusController was wrongly taking ownership of the FrameImpl.

Change-Id: I2f7bf7b9417dea33f4b4f4aa3bd763204e8e8a42
Reviewed-on: https://chromium-review.googlesource.com/c/1252901
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#597637}