Bug 1614462: Part 2c - Remove content mozbrowser tests. r=mccr8,marionette-reviewers,whimboo

<iframe mozbrowser> is no longer supported in content processes.

Differential Revision: https://phabricator.services.mozilla.com/D70744

browser/components/contextualidentity/test/browser/browser_broadcastchannel.js

@@ -18,48 +18,6 @@ async function openTabInUserContext(uri, userContextId) {
   return { tab, browser };
 }
 
-// Opens `uri' in a new <iframe mozbrowser> with the provided userContextId.
-// Returns the newly opened browser.
-async function addBrowserFrameInUserContext(uri, userContextId) {
-  // Create a browser frame with the user context and uri
-  const browser = document.createElementNS(
-    "http://www.w3.org/1999/xhtml",
-    "iframe"
-  );
-  browser.setAttribute("remote", "true");
-  browser.setAttribute("usercontextid", userContextId);
-  browser.setAttribute("mozbrowser", "true");
-  // `noisolation = true` means `OA.mInIsolatedMozBrowser = false` which matches
-  // the default for a XUL browser. It is indepedent from user contexts.
-  browser.setAttribute("noisolation", "true");
-  browser.setAttribute("src", uri);
-  gBrowser.tabpanels.appendChild(browser);
-
-  // Create a XUL browser-like API expected by test helpers
-  Object.defineProperty(browser, "messageManager", {
-    get() {
-      return browser.frameLoader.messageManager;
-    },
-    configurable: true,
-    enumerable: true,
-  });
-
-  await browserFrameLoaded(browser);
-
-  return { browser };
-}
-
-function browserFrameLoaded(browser) {
-  let event = "BrowserTestUtils:ContentEvent:load";
-  return BrowserTestUtils.waitForEvent(browser, event);
-}
-
-function removeBrowserFrame({ browser }) {
-  browser.remove();
-  // Clean up Browser API parent-side data
-  delete window._browserElementParents;
-}
-
 async function runTestForReceiver(receiver) {
   let channelName = "contextualidentity-broadcastchannel";
 
@@ -123,13 +81,3 @@ add_task(async function test() {
   await runTestForReceiver(receiver);
   gBrowser.removeTab(receiver.tab);
 });
-
-add_task(async function test() {
-  info("Checking broadcast channel with <iframe mozbrowser> receiver");
-  await SpecialPowers.pushPrefEnv({
-    set: [["dom.mozBrowserFramesEnabled", true]],
-  });
-  let receiver = await addBrowserFrameInUserContext(URI, 2);
-  await runTestForReceiver(receiver);
-  removeBrowserFrame(receiver);
-});