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Persistent filesystem is enabled by default in incognito mode. Storage
is still done in memory and is deleted when browsing session ends.

Tested:
third_party/blink/tools/run_blink_wptserve.py
out/Default/chrome --incognito \
http://localhost:8001/wpt_internal/file-system-api\
/temporary_vs_persistent.window.html

Bug: 990592
Change-Id: I2294dc65c79553917c28541897d5018afaa7b678
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1901079
Commit-Queue: Ramin Halavati <rhalavati@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713351}