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It's always created[1] with null SpecialStoragePolicy, so it doesn't actually do any cleanup, but its base class still does some bookkeeping, wasting memory. The actual cleanup for CONTENT_SETTING_SESSION_ONLY is done by SessionCleanupCookieStore in the network service process with help from its CookieSettings.

[1] For the chrome-extension:// cookie jar and for Android Webview when it creates the cookie jar itself.

Bug: 488710, 934009
Change-Id: I5bc34551e92e50e9cb799f99c804c24895c290a2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1906642Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Commit-Queue: Maksim Orlovich <morlovich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738948}