Make the mojom files under //mojo/services/network/interfaces basically the same as the ones in the…

mojo/services/network/interfaces/http_server.mojom

Index: mojo/services/network/interfaces/http_server.mojom
diff --git a/mojo/services/network/interfaces/http_server.mojom b/mojo/services/network/interfaces/http_server.mojom
index 789f48212dc36736dd298ad6d8cf524b83b88c10..685e592cbbbe578fd17edd97cb68ac6e497e5a7f 100644
--- a/mojo/services/network/interfaces/http_server.mojom
+++ b/mojo/services/network/interfaces/http_server.mojom
@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+[DartPackage="mojo_services"]
 module mojo;
 
 import "network/interfaces/http_connection.mojom";