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

examples/window_manager/window_manager.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;
+
 import "mojo/services/public/interfaces/geometry/geometry.mojom";
 
-module mojo {
-
 interface IWindowManager {
   CloseWindow(uint32 node_id);
 
   // Shows the keyboard for the specified view. |bounds| is the bounds of the
   // view that is showing focus. |bounds| is relative to the bounds of the node.
   // Events from the keyboard are routed to the view with id |view_id|.
   ShowKeyboard(uint32 view_id, mojo.Rect? bounds);
 
   // Hides the keyboard. This is ignored if |view_id| is not the view that was
   // last passed to ShowKeyboard().
   HideKeyboard(uint32 view_id);
 };
-
-}