Move shell interfaces into the shell.mojom namespace.

mojo/shell/public/interfaces/content_handler.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.shell.mojom;
 
 import "mojo/shell/public/interfaces/application.mojom";
 import "network/public/interfaces/url_loader.mojom";
 
 // Interface implemented by content handlers. To avoid race conditions with
 // dropped requests, the implementation should keep a reference to the lifetime
 // of the app (by holding on to AppRefCount). Each application started by
 // StartApplication should call the callback given by that method on
 // destruction. When the owner in the shell notices this, it will destroy the
 // interface pointer, which should cause the strongly-bound ContentHandler
 // implementation to self destruct and release the app reference.
 interface ContentHandler {
   // The callback should be called when the application is destructed.
-  StartApplication(Application& application, URLResponse response) => ();
+  StartApplication(Application& application, mojo.URLResponse response) => ();
 };