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The heavy ad intervention currently does not trigger when a blocklist
is not available. We do not setup the blocklist in incognito mode.

This change creates a blocklist for incognito profiles with no
backing store, which simply creates an in-memory blocklist. This allows
us to have very similar behavior across incognito & non-incognito.

Bug: 1022806
Change-Id: I0d1e48adc08eb6dd93fb8a9ac6dd6b848f0ca348
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1902528
Commit-Queue: John Delaney <johnidel@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713928}