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This change replaces js-test.js assertions with testharness.js assertions.
The expectation files are removed as they are not needed anymore.
To simplify review and landing, each change corrects at most 10 tests.

BUG=639732

Review-Url: https://codereview.chromium.org/2700823002
Cr-Commit-Position: refs/heads/master@{#453237}