ServiceWorker: Rewrite windowclient-navigate.html test.

third_party/WebKit/LayoutTests/http/tests/serviceworker/resources/windowclient-navigate-worker.js

 var port = null;
+var in_scope_but_not_controlled = null;
+
+self.oninstall = function(e) {
+  clients.matchAll({ includeUncontrolled : true }).then(function(cs) {
+        return cs[0].navigate('blank.html');
+      })
+    .catch(function(e) {
+        in_scope_but_not_controlled = e.name.toString();

[nhiroki, 2016/01/20 03:56:34]

This might not work because there should be only an "out-of-scope" client (ie.
"windowclient-navigate.html") on install phase.

Maybe we need to create an in-scope client before the worker is activated and
test it in the same way as other cases.

[zino, 2016/01/20 17:24:05]

Good catch!

+      });
+};
 
 self.onmessage = function(e) {
   port = e.data.port;
   port.onmessage = on_message;
-  port.postMessage('ready');
+  port.postMessage(in_scope_but_not_controlled);
 };
 
 function on_message(e) {
   var url = e.data;
   var client;
 
-  self.clients.matchAll({ includeUncontrolled : true }).then(function(cs) {
+  clients.matchAll({ includeUncontrolled : true }).then(function(cs) {
         cs.forEach(function(c) { c.frameType == 'nested' && (client = c); });
         return client.navigate(url);
       })
     .then(function(c) {
         if (!c)
           port.postMessage(c);
         else
           port.postMessage(c.url);
       })
     .catch(function(e) {
         port.postMessage(e.name);
       });
 }