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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: I03493aa3e62d8cac2b8b9d81ace5d44dbfa75915
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2496744Reviewed-by: Darwin Huang <huangdarwin@chromium.org>
Commit-Queue: Victor Costan <pwnall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821427}