Expose NavigatorHost via Embed() rather than globally.

mojo/services/public/interfaces/navigation/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.
 
 import "mojo/services/public/interfaces/network/url_loader.mojom"
 
 module mojo {
 
 // Expresses a preference for where a navigation will be performed.
 enum Target {
@@ skipping 19 matching lines @@
 
   URLResponse? response;
 
   // The URLLoader instance that generated the response. This must be kept
   // alive until the response body has been completely consumed.
   URLLoader? loader;
 };
 
 // Embedders that support navigation of implement this interface.
 interface NavigatorHost {
-  RequestNavigate(uint32 source_node_id, Target target,
-                  NavigationDetails? details);
+  RequestNavigate(Target target, NavigationDetails? details);
 
   // Applications call this to inform hosts of navigations they performed
   // locally. For example, pushState() navigations in an HTML application.
-  DidNavigateLocally(uint32 source_node_id, string? url);
-};
-
-// Applications implement this interface to support navigation of their views
-// by embedders.
-// |response_details| can be NULL when a navigation was not the result of a
-// network load.
-interface Navigator {
-  Navigate(uint32 node_id,
-           NavigationDetails? navigation_details,
-           ResponseDetails? response_details);
+  DidNavigateLocally(string? url);
 };
 
 }