OOR-CORS: update preflight cache expiration time upper limit
Currently, 14% of cache accesses result in cache-hit with stale entry. This rate is a little high compared to cache-miss, happening at 18%. This patch updates the expiration time upper limit from 10 minutes to 2 hours so that the stale rate would not dominate. I expect this would change the stale rate to be <5%. But if this doesn't, I will revert this change. Bug: 131368 Change-Id: I18f91c60b441128f966cd1f20743ca69e9091d75 Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1614003 Commit-Queue: Takashi Toyoshima <toyoshim@chromium.org> Commit-Queue: Yutaka Hirano <yhirano@chromium.org> Auto-Submit: Takashi Toyoshima <toyoshim@chromium.org> Reviewed-by:Yutaka Hirano <yhirano@chromium.org> Cr-Commit-Position: refs/heads/master@{#660331}
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