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Using the EmbeddedTestServer will make the same test pass before/after
the underlying code is switched to use the network service. The new
test is also more integrationy, using real network requests, which
seems particularly useful here, as this is the only code that sends
chunked uploads in Chrome. The one downside is that it requires a
test-only method to set the server URL.

Bug: 810555
Change-Id: I46b9321f83027cbc1c3a002ce1b35b693a6560aa
Reviewed-on: https://chromium-review.googlesource.com/987526
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Max Morin <maxmorin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#548328}