Convert a bunch of tests to use scheduled_test's infrastructure.

This makes the tests cleaner and more concise, as well as providing more
information for debugging.

This gets rid of the "does not preserve state" browser tests, because it turns
out that they weren't actually doing anything anyway (otherwise IE would have
failed, since it *does* preserve state). It also adds tests for every browser
being able to run successful and failing tests.

R=kevmoo@google.com

Review URL: https://codereview.chromium.org//1243293002 .