Bug 1502556 - Conditionally add browser.xul instead of browser.xhtml to browser_all_files_referenced.js;r=Gijs

Differential Revision: https://phabricator.services.mozilla.com/D9980

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

browser/base/content/test/static/browser_all_files_referenced.js

@@ -170,7 +170,8 @@ var whitelist = [
   {file: "chrome://global/content/bindings/toolbar.xml",
    platforms: ["macosx", "win"]},
   // Bug 1483277 (temporarily unreferenced)
-  {file: "chrome://browser/content/browser.xhtml"},
+  {file: AppConstants.BROWSER_CHROME_URL == "chrome://browser/content/browser.xul" ?
+    "chrome://browser/content/browser.xhtml" : "chrome://browser/content/browser.xul" },
   // Bug 1494170
   // (The references to these files are dynamically generated, so the test can't
   // find the references)