GitLab

This rolls testharness.js, idlharness.js, and webidl2.js to WPT
SHA 39b27a7875 (https://github.com/web-platform-tests/wpt/commit/39b27a7875).
The primary purpose is to consume the assert_throws/promise_rejects API
removals. It does not roll to WPT HEAD as shortly after this SHA an API
change occurs in the assert_throws_dom/promise_rejects_dom APIs that
will require work in Chromium to consume.

Some fixes done alongside:
  * One use of assert_throws fixed in payment-request-interface.html
  * Three expected files that reference line numbers in testharness.js
    updated for the new version.

Bug: 1051932
Change-Id: I9cc1c8235ce88262a6a7a2905d0996ba64fe9866
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2129897Reviewed-by: Luke Z <lpz@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756241}