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With the default size, tests cannot be run multiple times without
amberctl gc. See fxbug.dev/60978.

Change-Id: Ifebe7c046ead1fd302a7f3b549ae28d0499f94a1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2516885
Commit-Queue: David Dorwin <ddorwin@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823785}