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Some assert_throws statements did not include expected exceptions, which
broke their respective tests following a testharness.js update. Add
expected exceptions for all assert_throws statements. The only
functional change was to fast/serviceworker/serviceworker-interface.html
as per the spec ServiceWorker extends EventTarget and not Worker.

Bug: 754365
Change-Id: I733605d721085788d43e179ca6f9a7c7b25da995
Reviewed-on: https://chromium-review.googlesource.com/1056253Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Commit-Queue: Chris Nardi <cnardi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558476}