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It's possible the AppCacheQuotaClient's callback is holding the last
reference to QuotaManager, which means QuotaManager gets destroyed when
those callbacks are run. This causes AppCacheQuotaClient to be destroyed
when it is still executing code in NotifyAppCacheDestroyed.

Bug: 1003298
Change-Id: I07afe921c10f34c9bdee8c020b7194e659337281
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1827490
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700381}