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This one of only two tests using BrowserTestBase::spawned_test_server().
We want to reduce the use of the test server for a variety of reasons,
and removing access from BrowserTestBase is a good way to decrease
visibility of the spawned test server.

Also remove the download-known-size handler from the SpawnedTestServer's
Python code, as this was the only remaining test using that method.

Bug: 492672
Change-Id: Ib4836b9db3beb6a3f1f8598dea63fb262bf24dbb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498644
Commit-Queue: Matt Menke <mmenke@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821260}