Bug 1446571: Add missing semicolon. r=eslint-fix DONTBUILD CLOSED TREE

MozReview-Commit-ID: FikjFYLirlG

--HG--
extra : amend_source : 99d4543109bb40096f3978c26f7d215825d9bbe5

toolkit/components/extensions/test/xpcshell/head.js

@@ -37,7 +37,7 @@ ExtensionTestUtils.init(this);
 var createHttpServer = (...args) => {
   AddonTestUtils.maybeInit(this);
   return AddonTestUtils.createHttpServer(...args);
-}
+};
 
 if (AppConstants.platform === "android") {
   Services.io.offline = true;