Import w3c tests for the service workers

third_party/WebKit/LayoutTests/imported/wpt/service-workers/service-worker/resources/skip-waiting-installed-worker.js

-// TODO(nhiroki): stop using global states because service workers can be killed
-// at any point (http://crbug.com/558244).
 self.state = 'starting';
 
 self.addEventListener('install', function() {
     self.state = 'installing';
   });
 
-self.addEventListener('activate', function() {
-    self.state = 'activating';
-  });
-
 self.addEventListener('message', function(event) {
     var port = event.data.port;
     if (self.state !== 'installing') {
       port.postMessage('FAIL: Worker should be waiting in installed state');
       return;
     }
-    event.waitUntil(self.skipWaiting()
+    self.skipWaiting()
       .then(function(result) {
           if (result !== undefined) {
             port.postMessage('FAIL: Promise should be resolved with undefined');
             return;
           }
-          if (self.state !== 'activating') {
-            port.postMessage(
-                'FAIL: Promise should be resolved after worker activated');
-            return;
-          }
           port.postMessage('PASS');
         })
       .catch(function(e) {
           port.postMessage('FAIL: unexpected exception: ' + e);
-        }));
+        });
   });