[ServiceWorker] Tests for WindowClient.focus().

LayoutTests/http/tests/serviceworker/resources/client-focus.js

Index: LayoutTests/http/tests/serviceworker/resources/client-focus.js
diff --git a/LayoutTests/http/tests/serviceworker/resources/client-focus.js b/LayoutTests/http/tests/serviceworker/resources/client-focus.js
deleted file mode 100644
index d8c06ec50d1cc146e814385e7765fa00ee55614e..0000000000000000000000000000000000000000
--- a/LayoutTests/http/tests/serviceworker/resources/client-focus.js
+++ /dev/null
@@ -1,15 +0,0 @@
-self.onmessage = function(e) {
-  self.clients.getAll().then(function(clients) {
-    clients.forEach(function(client) {
-      if (('focus' in client) && (typeof(client.focus) == 'function'))
-        client.postMessage('focus() is present');
-      client.focus().then(function(result) {
-        client.postMessage('focus() succeeded with ' + result);
-        client.postMessage('quit');
-      }, function(e) {
-        client.postMessage('focus() failed with ' + e.name);
-        client.postMessage('quit');
-      });
-    });
-  });
-}