Move shell service to toplevel shell namespace

services/shell/public/interfaces/shell.mojom

 // Copyright 2015 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.shell.mojom;
+module shell.mojom;
 
 import "services/shell/public/interfaces/connector.mojom";
 
 struct InstanceInfo {
   uint32 id;
   Identity identity;
   uint32 pid;
 };
 
 // Implemented by a client that wishes to be informed when the list of running
@@ skipping 16 matching lines @@
   // Called when a pid is available for the instance. This could be because a
   // process was created by the runner for it, or because an existing content
   // handler process was assigned.
   InstancePIDAvailable(uint32 id, uint32 pid);
 };
 
 interface Shell {
   // The listener is removed when the |listener| pipe is closed.
   AddInstanceListener(InstanceListener listener);
 };