Bug 1582116 - Use SpecialPowers.spawn for iframe accesses in test_prompt_async. r=sfoster

The `fail-if = fission` will be fixed by bug 1582117 now.

Differential Revision: https://phabricator.services.mozilla.com/D56862

--HG--
extra : moz-landing-system : lando

testing/modules/TestUtils.jsm

@@ -150,7 +150,7 @@ var TestUtils = {
    * @param condition
    *        A condition function that must return true or false. If the
    *        condition ever throws, this is also treated as a false. The
-   *        function can be a generator.
+   *        function can be an async function.
    * @param interval
    *        The time interval to poll the condition function. Defaults
    *        to 100ms.

toolkit/components/passwordmgr/test/mochitest/mochitest.ini

@@ -145,7 +145,7 @@ skip-if = toolkit == 'android' # bug 1535505
 [test_prompt.html]
 skip-if = os == "linux" || toolkit == 'android' # Tests desktop prompts
 [test_prompt_async.html]
-fail-if = fission # bug 1582116
+fail-if = fission # bug 1582117
 skip-if = toolkit == 'android' # Tests desktop prompts
 support-files = subtst_prompt_async.html
 [test_prompt_http.html]

toolkit/components/passwordmgr/test/mochitest/test_prompt_async.html

@@ -79,8 +79,10 @@
       }
 
       function promiseProxyErrorLoad(frame) {
-        return TestUtils.waitForCondition(() => {
-          return SpecialPowers.wrap(frame.contentWindow).document.documentURI.includes("proxyConnectFailure");
+        return TestUtils.waitForCondition(async function checkForProxyConnectFailure() {
+          return SpecialPowers.spawn(frame, [], function() {
+            return this.content.document.documentURI.includes("proxyConnectFailure");
+          })
         }, "Waiting for proxyConnectFailure documentURI");
       }
 
@@ -501,7 +503,9 @@
         // the unauthenticated content.
 
         let iframe1DocPromise = promiseLoadedContentDoc(iframe1);
-        SpecialPowers.wrap(iframe1).contentDocument.location.reload();
+        await SpecialPowers.spawn(iframe1, [], function() {
+          this.content.document.location.reload();
+        });
 
         let state = {
           msg: "http://example.com is requesting your username and password. WARNING: Your password will not be sent to the website you are currently visiting!",