Bug 1479744 - Clear search history to prevent TV perma fail for browser/base/content/test/about/browser_aboutHome_search_composing.js r=adw

Differential Revision: https://phabricator.services.mozilla.com/D14769

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

browser/base/content/test/about/browser_aboutHome_search_composing.js

@@ -15,6 +15,22 @@ add_task(async function() {
     Services.search.defaultEngine = engine;
     await p;
 
+    // Clear any search history results
+    await new Promise((resolve, reject) => {
+      FormHistory.update({op: "remove"}, {
+        handleError(error) {
+          reject(error);
+        },
+        handleCompletion(reason) {
+          if (!reason) {
+            resolve();
+          } else {
+            reject();
+          }
+        },
+      });
+    });
+
     await ContentTask.spawn(browser, null, async function() {
       // Start composition and type "x"
       let input = content.document.querySelector(["#searchText", "#newtab-search-text"]);

browser/base/content/test/about/head.js

@@ -1,5 +1,9 @@
 /* eslint-env mozilla/frame-script */
 
+XPCOMUtils.defineLazyModuleGetters(this, {
+  FormHistory: "resource://gre/modules/FormHistory.jsm",
+});
+
 function injectErrorPageFrame(tab, src) {
   return ContentTask.spawn(tab.linkedBrowser, {frameSrc: src}, async function({frameSrc}) {
     let loaded = ContentTaskUtils.waitForEvent(content.wrappedJSObject, "DOMFrameContentLoaded");