--- a/testing/web-platform/meta/MANIFEST.json
+++ b/testing/web-platform/meta/MANIFEST.json
@@ -575905,17 +575905,17 @@
    "bab0a2227994194c58e23edb3080d519ea453d1e",
    "testharness"
   ],
   "web-animations/interfaces/Animation/finish.html": [
    "629203bd3888631c616093315f2c3f1219486131",
    "testharness"
   ],
   "web-animations/interfaces/Animation/finished.html": [
-   "680fe7552b0cf5a246e11cd63540b343f56608bf",
+   "7543a989508e10c1448668795a5c2de6071838f5",
    "testharness"
   ],
   "web-animations/interfaces/Animation/id.html": [
    "2e40d20a3b221a4b99e776bdeb951c7cba173f57",
    "testharness"
   ],
   "web-animations/interfaces/Animation/idlharness.html": [
    "b369d57caf6557abee257ecbae0c7b4fd49965d7",

--- a/testing/web-platform/tests/web-animations/interfaces/Animation/finished.html
+++ b/testing/web-platform/tests/web-animations/interfaces/Animation/finished.html
@@ -177,37 +177,16 @@ promise_test(t => {
                       'A new finished promise should be created when'
                       + ' cancelling a finished animation');
   });
 }, 'cancelling an already-finished animation replaces the finished promise');
 
 promise_test(t => {
   const div = createDiv(t);
   const animation = div.animate({}, 100 * MS_PER_SEC);
-  animation.cancel();
-  // The spec says we still create a new finished promise and reject the old
-  // one even if we're already idle. That behavior might change, but for now
-  // test that we do that.
-  const retPromise = animation.finished.catch(err => {
-    assert_equals(err.name, 'AbortError',
-                  'finished promise is rejected with AbortError');
-  });
-
-  // Redundant call to cancel();
-  const previousFinishedPromise = animation.finished;
-  animation.cancel();
-  assert_not_equals(animation.finished, previousFinishedPromise,
-                    'A redundant call to cancel() should still generate a new'
-                    + ' finished promise');
-  return retPromise;
-}, 'cancelling an idle animation still replaces the finished promise');
-
-promise_test(t => {
-  const div = createDiv(t);
-  const animation = div.animate({}, 100 * MS_PER_SEC);
   const HALF_DUR = 100 * MS_PER_SEC / 2;
   const QUARTER_DUR = 100 * MS_PER_SEC / 4;
   let gotNextFrame = false;
   let currentTimeBeforeShortening;
   animation.currentTime = HALF_DUR;
   return animation.ready.then(() => {
     currentTimeBeforeShortening = animation.currentTime;
     animation.effect.timing.duration = QUARTER_DUR;