Bug 1759031: Let user-action-pseudo-classes-in-has.html rely on act…

…ions being completed. r=emilio

Previously, the test relied upon event listener to listen to related events:
e.g. `mousedown` event on `Actions().pointerDown()`. However, as comments in
whatwg/html#7578 indicate when `:active` matches
does not seem to be interoperable across browsers with different inputs.
Instead rely on the action sequence being completed, as done with a simliar
test, `html/semantics/selectors/pseudo-classes/active-disabled.html`.

Differential Revision: https://phabricator.services.mozilla.com/D193463

UltraBlame original commit: adc6a6f51dfa6facc44c1afe4bf3455c3bf32fad

testing/web-platform/meta/css/selectors/invalidation/user-action-pseudo-classes-in-has.html.ini

@@ -13,35 +13,22 @@ has
 .
 html
 ]
-expected
-:
-if
-os
-=
-=
-"
-mac
-"
-:
-ERROR
 [
+CSS
+Selectors
 Invalidation
-with
-:
-focus
-:
-focus
--
-within
 :
-focus
+user
 -
-visible
+action
+pseudo
+classes
 in
 :
 has
 (
 )
+argument
 ]
 expected
 :
@@ -53,5 +40,4 @@ os
 mac
 "
 :
-TIMEOUT
 FAIL