Bug 1797124 - Expose WritableStreamDefaultController signal everywhere r=smaug

Differential Revision: https://phabricator.services.mozilla.com/D160130

dom/webidl/WritableStreamDefaultController.webidl

@@ -9,13 +9,7 @@
 
 [Exposed=*, Pref="dom.streams.writable_streams.enabled"]
 interface WritableStreamDefaultController {
+  readonly attribute AbortSignal signal;
   [Throws]
   undefined error(optional any e);
 };
-
-// TODO: AbortSignal is not exposed on Worklet
-[Exposed=(Window,Worker)]
-partial interface WritableStreamDefaultController {
-  readonly attribute AbortSignal signal;
-};
-

testing/web-platform/meta/streams/idlharness-shadowrealm.window.js.ini

@@ -1,9 +1,6 @@
 [idlharness-shadowrealm.window.html]
   prefs: [javascript.options.experimental.shadow_realms:true]
+
   [ReadableStream interface: async iterable<any>]
     bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1734244
     expected: FAIL
-
-  [WritableStreamDefaultController interface: attribute signal]
-    bug: https://bugzilla.mozilla.org/show_bug.cgi?id=1797124
-    expected: FAIL