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These tests run the basic_test.js tests after loading the service
worker. As a result, now that basic_test.js has been adapted to run
with the flag enabled in
https://chromium-review.googlesource.com/c/chromium/src/+/2376871,
these tests pass with both flag states and just need to be
parameterized so that they are run on the bots with both.

Bug: 1120279
Change-Id: I25628e049946745432277701d555009ecae8fe37
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2381061Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#802721}