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This CL replaces smart pointers (scoped_refptr) with references where
the pointers are guaranteed to be non-null, and the objects are only
used during the method call.

This removes the test's reliance on QuotaClient being ref-counted, which
will come in handy when QuotaClient gets mojofied.

Bug: 1016065
Change-Id: I0ec5ea2f40c03bbdb4e6af504d6f2b4902115c31
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2496743
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821432}