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This is a part-automated / part-manual process to migrate these /startup/
tests to the new integration test framework:

1. extract the precondition activities into an html file for the inspected
window.
2. add TestRunner.setupStartupTest(...) as the first line of the js test to
navigate to the inspected window before the DevTools session is started.
3. add testRunner.navigateSecondaryWindow(...) once the inspected page is
done w/ the precondition activities.

Bug: 667560
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_mojo
Change-Id: I708c0719aa8ccdb38161e558fd535de12e7ccf9f
Reviewed-on: https://chromium-review.googlesource.com/821517
Commit-Queue: Will Chen <chenwilliam@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#523671}