Simplify TestRunnerBindings::SimulateWebNotificationClick param handling

third_party/WebKit/LayoutTests/http/tests/notifications/resources/test-helpers.js

 // Supports test-runner control messages being send over |messagePort|, which enable
 // workers to have limited access to TestRunner methods.
 function supportTestRunnerMessagesOnPort(messagePort)
 {
     if (!window.testRunner)
         return;
 
     messagePort.addEventListener('message', function(message) {
         if (message.data.type == 'simulateWebNotificationClick')
-            testRunner.simulateWebNotificationClick(message.data.title);
+            testRunner.simulateWebNotificationClick(message.data.title, -1 /* action_index */);
     });
 }
 
 // Starts |script| as a dedicated worker and executes the testharness tests defined
 // within it. The Notification-related testRunner methods will be made available.
 function dedicatedWorkerTest(script)
 {
     var worker = new Worker(script);
     supportTestRunnerMessagesOnPort(worker);
 
@@ skipping 38 matching lines @@
             messageChannel.port1.addEventListener('message', function(event) {
                 if (event.data == 'ready')
                     resolve({ registration: registration, port: messageChannel.port1 });
             });
 
             registration.active.postMessage(messageChannel.port2, [messageChannel.port2]);
             messageChannel.port1.start();
         });
     });
 }