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This prevents tests that expect frames to be evicted from the cache
from incorrectly passing (due to timed expiration).

Change-Id: I41507b8fa808b1d5019bd1777706919a53c38407
Bug: 987187
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1813335
Commit-Queue: Lowell Manners <lowell@chromium.org>
Reviewed-by: Alexander Timin <altimin@chromium.org>
Reviewed-by: Arthur Sonzogni <arthursonzogni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#698839}