[WIP] Move Web Notifications to a WebFrame-less code path (Blink).

LayoutTests/fast/notifications/resources/notification-click.js

+if (self.importScripts) {
+    importScripts('../../../resources/js-test.js');
+    importScripts('notification-worker.js');
+}
+
 function runTest()
 {
     var notification = new Notification("Notification");
     notification.addEventListener("show", function() {
         testPassed("notification.onshow() has been called.");
-        if (window.testRunner)
+        if (testRunner)
             testRunner.simulateWebNotificationClick("Notification");
     });
 
     notification.addEventListener("click", function() {
         testPassed("notification.onclick() has been called.");
-        notification.close();
-
-        if (window.testRunner)
-            testRunner.notifyDone();
+        finishJSTest();
     });
 }