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Without using this, the Platform object is not replaced when the test
class shuts down. This makes the next test to run have a Platform
pointer to a deleted object, and causes a crash if any future tests
in the shard will try to use the Platform.

R=avi@chromium.org, pdr@chromium.org

Bug: 419087, 745091
Change-Id: I09145e6a6a8ad1b0b1f9d0d77f04dc147a90972a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1726730Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Philip Rogers <pdr@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682445}