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QuotaManager currently uses a custom deleter that ensures the deletion happens on the IO thread. This CL removes the custom logic, and instead
has QuotaManager inherit from RefCountedDeleteOnSequence.

This CL was previously submitted with https://crrev.com/c/1479302 as d82ad3d0. It is currently broken up to
minimize the impact of a potential revert.

Change-Id: If39890da03f577771b31faf71a1ae479ca11cc9d
Reviewed-on: https://chromium-review.googlesource.com/c/1481591
Commit-Queue: Jarryd Goodman <jarrydg@chromium.org>
Reviewed-by: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635213}