Convert text-served* and remove-while* tests to testharness.js
Cleaning up text-served* and remove-while* tests in http/tests/media/
to use testharness.js instead of video-test.js.
This will enable to upstream these tests to web-platform-tests.
BUG=
588956
Committed:
https://crrev.com/999b2af6d526ba02ff213fc82589137316a0cbc5
Cr-Commit-Position: refs/heads/master@{#406847}