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

mojo/services/network/interfaces/http_message.mojom

Index: mojo/services/network/interfaces/http_message.mojom
diff --git a/mojo/services/network/interfaces/http_message.mojom b/mojo/services/network/interfaces/http_message.mojom
index bba72cf199d65883775e06fc7fb4d58a45f4e448..b1093d26cd3c6cc080d85299f48434ddb0dbad1e 100644
--- a/mojo/services/network/interfaces/http_message.mojom
+++ b/mojo/services/network/interfaces/http_message.mojom
@@ -2,9 +2,10 @@
 // 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 "third_party/mojo/src/mojo/public/interfaces/network/http_header.mojom";
+import "mojo/public/interfaces/network/http_header.mojom";
 
 struct HttpRequest {
   string method = "GET";