CSP: Upstream worker tests to WPT repository.

https://codereview.chromium.org/2540983003 touched a number of tests that
should have landed in the upstream repository. This patch rewrites those
tests, and dedupes them against a number of existing tests that we don't
need anymore.

BUG=694525

Review-Url: https://codereview.chromium.org/2765443003
Cr-Commit-Position: refs/heads/master@{#458346}
21 files changed