Clean up URLFetcher unit tests, part 6.
Clean up URLFetcher unit tests, part 6.

Convert URLFetcher[Upload/Download]Progress tests to use
the shared test fixture.  Also add a bonus test where we
cancel/delete a fetcher in an upload progress callback.

BUG=471069

Review URL: https://codereview.chromium.org/1090003003

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#325565}

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