RFC 183: remove experimental dump_test_results function in <testharnessreport.js> (#192)

Author: Mirko Brodesser

rfcs/rfc183_remove_unused_dump_test_results_function_in_testharnessreport_js.md

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+# RFC 183: Remove experimental `dump_test_results` function in <testharnessreport.js>
+
+## Summary
+That function is still called but the element it creates is never accessed. The created element contains stringified JSON of test result data.
+PR [^1] proposes to remove the function. It was added in 2015 with the comment "This is experimental until we have a better way to integrate with saucelabs".
+PR [^2] reduces the performance of the generating the test results' summary table which is consumed by `dump_test_results`.
+If that function is never used, degraded performance doesn't matter.
+
+## Details
+See [^3] and [^4].
+
+## Risks
+None known as the element generated from the function seems unused in WebKit, Gecko and Chromium; see [^3].
+It could be used in other downstream-projects, though.
+
+[^1]: https://github.com/web-platform-tests/wpt/pull/45003
+[^2]: https://github.com/web-platform-tests/wpt/pull/45002
+[^3]: https://github.com/web-platform-tests/wpt/pull/45003#issue-2176117406
+[^4]: https://github.com/web-platform-tests/wpt/issues/44352#issuecomment-1985862862