Roll new WPT js code.

This rolls up to sha 7da1d0666575e5735fd1286e6b3e67e9973f4643

Just one minor change to testharness, likely a no-op

Change-Id: Ia7e1318684542156d1906f1e67c7508aed903bac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392438
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Auto-Submit: Luke Z <lpz@chromium.org>
Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804304}

third_party/blink/web_tests/resources/testharness.js

@@ -2084,7 +2084,7 @@ policies and contribution forms [3].
                                                   timeout=3000, interval=100) {
         /**
          * Poll for a function to return true, and invoke a callback
-         * followed this.done() once it does, or assert if a timeout
+         * followed by this.done() once it does, or assert if a timeout
          * is reached. This is preferred over a simple step_timeout
          * whenever possible since it allows the timeout to be longer
          * to reduce intermittents without compromising test execution speed
@@ -3998,5 +3998,5 @@ span.ok, span.timeout, span.error {\
 }\
 ";
 
-})(this);
+})(self);
 // vim: set expandtab shiftwidth=4 tabstop=4: