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Like several IndexedDB tests, KV Storage can cause timeouts unless given more time.

BUG=936615

Change-Id: I8069d77088625b32867a5ebcc9ce69c4810a18ac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1670621Reviewed-by: Joshua Bell <jsbell@chromium.org>
Commit-Queue: Domenic Denicola <domenic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#671576}