test: add AbortController to knownGlobals

PR-URL: #53020
Reviewed-By: Moshe Atlow <moshe@atlow.co.il>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

test/common/index.js

@@ -280,6 +280,7 @@ function platformTimeout(ms) {
 }
 
 let knownGlobals = [
+  AbortController,
   atob,
   btoa,
   clearImmediate,
@@ -292,15 +293,6 @@ let knownGlobals = [
   queueMicrotask,
 ];
 
-// TODO(@jasnell): This check can be temporary. AbortController is
-// not currently supported in either Node.js 12 or 10, making it
-// difficult to run tests comparatively on those versions. Once
-// all supported versions have AbortController as a global, this
-// check can be removed and AbortController can be added to the
-// knownGlobals list above.
-if (global.AbortController)
-  knownGlobals.push(global.AbortController);
-
 if (global.gc) {
   knownGlobals.push(global.gc);
 }