Move services code brought in from Mojo to live under //third_party.

mojo/services/navigation/public/interfaces/navigation.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 "network/public/interfaces/url_loader.mojom";
-
-// Expresses a preference for where a navigation will be performed.
-enum Target {
-  // No preference
-  DEFAULT,
-
-  // In the same ViewManager node that the navigation was initiated
-  SOURCE_NODE,
-
-  // In a new ViewManager node
-  NEW_NODE
-};
-
-// Embedders that support navigation of implement this interface.
-interface NavigatorHost {
-  RequestNavigate(Target target, URLRequest request);
-
-  // Applications call this to inform hosts of navigations they performed
-  // locally. For example, pushState() navigations in an HTML application.
-  DidNavigateLocally(string url);
-};