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All asserts need to be in a step func. Unfortunately this makes the
tests more verbose.

Found in https://github.com/web-platform-tests/wpt/pull/8748#issuecomment-398954260.

Change-Id: Ib15270d6093ea094b0f8c387cc4370f5154cf5dd
Reviewed-on: https://chromium-review.googlesource.com/1109689
Commit-Queue: Robert Ma <robertma@chromium.org>
Reviewed-by: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569401}