Fix accessing the bootstrap methods when they are declared in the new lexical scope

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

@@ -0,0 +1,17 @@
+/* Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/publicdomain/zero/1.0/
+ */
+
+createAppInfo("xpcshell@tests.mozilla.org", "XPCShell", "1", "1");
+startupManager();
+
+add_task(function*() {
+  let sawInstall = false;
+  Services.obs.addObserver(function() {
+    sawInstall = true;
+  }, "addon-install", false);
+
+  yield promiseInstallAllFiles([do_get_addon("test_bootstrap_const")]);
+
+  ok(sawInstall);
+});