Bug 1258858: Fix harmless console errors in test_webextension.js. r=aswan

MozReview-Commit-ID: aDNfOANJOO

--HG--
extra : rebase_source : ce5dc8d483fb367c70bbb34dc9e24e6fda530ad2

toolkit/mozapps/extensions/test/xpcshell/head_addons.js

@@ -1742,7 +1742,6 @@ function promiseInstallAllFiles(aFiles, aIgnoreIncompatible) {
   let deferred = Promise.defer();
   installAllFiles(aFiles, deferred.resolve, aIgnoreIncompatible);
   return deferred.promise;
-
 }
 
 if ("nsIWindowsRegKey" in AM_Ci) {

toolkit/mozapps/extensions/test/xpcshell/test_webextension.js

@@ -163,8 +163,10 @@ add_task(function* test_manifest_localization() {
   const ID = "webextension3@tests.mozilla.org";
 
   yield promiseInstallAllFiles([do_get_addon("webextension_3")], true);
+  yield promiseAddonStartup();
 
   let addon = yield promiseAddonByID(ID);
+  addon.userDisabled = true;
 
   equal(addon.name, "Web Extensiøn foo ☹");
   equal(addon.description, "Descriptïon bar ☹ of add-on");
@@ -184,6 +186,8 @@ add_task(function* test_manifest_localization() {
 
   equal(addon.name, "Web Extensiøn foo ☹");
   equal(addon.description, "Descriptïon bar ☹ of add-on");
+
+  addon.uninstall();
 });
 
 // Missing ID should cause a failure