Fix HttpServerAppTest.WebSocket.

The Mojo SDK removed the mojo::Array<T> constructor that takes a size
(in favor of mojo::Array<T>::New()) and added on that takes nullptr_t.
Unfortunately, hilarity ensues in the case of mojo::Array<T>(0).

R=jamesr@chromium.org

Review URL: https://codereview.chromium.org/1840133004 .
diff --git a/mojo/services/network/http_server_apptest.cc b/mojo/services/network/http_server_apptest.cc
index 841e44f..38f9e86 100644
--- a/mojo/services/network/http_server_apptest.cc
+++ b/mojo/services/network/http_server_apptest.cc
@@ -285,7 +285,7 @@
     send_stream_ = data_pipe.producer_handle.Pass();
     write_send_stream_.reset(new WebSocketWriteQueue(send_stream_.get()));
 
-    web_socket_->Connect(url, Array<String>(0), "http://example.com",
+    web_socket_->Connect(url, Array<String>::New(0), "http://example.com",
                          data_pipe.consumer_handle.Pass(),
                          client_handle_.Pass());
   }