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This CL replaces the test's base::test::TaskEnvironment with a
content::BrowserTaskEnvironment.

The QuotaClient mojofication benefits from having this test use a
content::BrowserTaskEnvironment, which can supply a TaskRunner for the
IO thread.

Bug: 1016065
Change-Id: Ia5cbe1a1ecafc6fd0d37972c28a44dfb5bc2d0ca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2519884
Commit-Queue: Victor Costan <pwnall@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Auto-Submit: Victor Costan <pwnall@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824215}