Bug 1588846 - move browser_bug839103.js somewhere more topical and make it pass with fission enabled, r=mccr8

Differential Revision: https://phabricator.services.mozilla.com/D49322

--HG--
rename : browser/base/content/test/general/browser_bug839103.js => layout/base/tests/browser_bug839103.js
rename : browser/base/content/test/general/bug839103.css => layout/base/tests/bug839103.css
rename : browser/base/content/test/general/test_bug839103.html => layout/base/tests/file_bug839103.html
extra : moz-landing-system : lando

browser/base/content/test/general/browser.ini

@@ -23,7 +23,6 @@ support-files =
   bug792517-2.html
   bug792517.html
   bug792517.sjs
-  bug839103.css
   clipboard_pastefile.html
   discovery.html
   download_page.html
@@ -46,7 +45,6 @@ support-files =
   searchSuggestionEngine2.xml
   test_bug462673.html
   test_bug628179.html
-  test_bug839103.html
   title_test.svg
   unknownContentType_file.pif
   unknownContentType_file.pif^headers^
@@ -222,9 +220,6 @@ skip-if = os == 'linux' && !debug && bits == 64 # Bug 1556066
 # DO NOT ADD MORE TESTS HERE. USE A TOPICAL DIRECTORY INSTEAD.
 [browser_bug832435.js]
 # DO NOT ADD MORE TESTS HERE. USE A TOPICAL DIRECTORY INSTEAD.
-[browser_bug839103.js]
-# DO NOT ADD MORE TESTS HERE. USE A TOPICAL DIRECTORY INSTEAD.
-skip-if = fission
 [browser_bug882977.js]
 # DO NOT ADD MORE TESTS HERE. USE A TOPICAL DIRECTORY INSTEAD.
 [browser_bug1015721.js]

layout/base/tests/browser.ini

@@ -1,6 +1,10 @@
 [DEFAULT]
 
 [browser_bug617076.js]
+[browser_bug839103.js]
+support-files =
+  file_bug839103.html
+  bug839103.css
 [browser_disableDialogs_onbeforeunload.js]
 [browser_onbeforeunload_only_after_interaction.js]
 [browser_onbeforeunload_only_after_interaction_in_frame.js]

layout/base/tests/browser_bug839103.js

@@ -5,7 +5,7 @@ const gTestRoot = getRootDirectory(gTestPath).replace(
 
 add_task(async function test() {
   await BrowserTestUtils.withNewTab(
-    { gBrowser, url: "about:blank" },
+    { gBrowser, url: gTestRoot + "file_bug839103.html" },
     async function(browser) {
       await ContentTask.spawn(browser, gTestRoot, testBody);
     }
@@ -17,10 +17,6 @@ add_task(async function test() {
 async function testBody(testRoot) {
   const gStyleSheet = "bug839103.css";
 
-  let loaded = ContentTaskUtils.waitForEvent(this, "load", true);
-  content.location = testRoot + "test_bug839103.html";
-
-  await loaded;
   function unexpectedContentEvent(event) {
     ok(false, "Received a " + event.type + " event on content");
   }