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Once AppCache has been removed from Chrome, sites will have no way of
cleaning up user data in local profiles.  To fix this, when a storage
partition is accessed when AppCache has been disabled, we will delete
the AppCache directory from that profile directory.

This is a relanding of:
https://chromium-review.googlesource.com/c/chromium/src/+/2343588

Bug: 1081897
Change-Id: I14498094d0262c2806eb66ca3cfde85956d59d17
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2357071Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Auto-Submit: enne <enne@chromium.org>
Commit-Queue: Jeremy Roman <jbroman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#799952}