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

examples/keyboard/keyboard.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;
 
 [Client=KeyboardClient]
 interface KeyboardService {
   // Sets the view keyboard events are to go to.
   SetTarget(uint32 view_id);
 };
 
 interface KeyboardClient {
   // Invoked when the user interacts with the keyboard. |code| is a key code
   // |flags| is a bitmask of ui::EventFlags.
   OnKeyboardEvent(uint32 view_id, int32 code, int32 flags);
 };
-
-}