mojom: Remove braces from module statements and make them come first.

examples/apptest/example_service.mojom

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-module mojo {
+module mojo;
 
 // A simple service used to exemplify application testing within mojo_shell.
 [Client=ExampleClient]
 interface ExampleService {
   // Calls ExampleClient::Pong with |ping_value|.
   Ping(uint16 ping_value);
 
   // Runs the argument callback.
   RunCallback() => ();
 };
 
 interface ExampleClient {
   Pong(uint16 pong_value);
 };
-
-}