Changes ownership of WindowTreeClient

services/navigation/view_impl.h

Index: services/navigation/view_impl.h
diff --git a/services/navigation/view_impl.h b/services/navigation/view_impl.h
index f502bce19160b8ea637562efb70e17690e3b0a2b..0f4199c4273785a21678e3463e7ab74c130865df 100644
--- a/services/navigation/view_impl.h
+++ b/services/navigation/view_impl.h
@@ -81,7 +81,8 @@ class ViewImpl : public mojom::View,
 
   // ui::WindowTreeClientDelegate:
   void OnEmbed(ui::Window* root) override;
-  void OnDidDestroyClient(ui::WindowTreeClient* client) override;
+  void OnEmbedRootDestroyed(ui::Window* root) override;
+  void OnLostConnection(ui::WindowTreeClient* client) override;
   void OnPointerEventObserved(const ui::PointerEvent& event,
                               ui::Window* target) override;
 
@@ -95,6 +96,8 @@ class ViewImpl : public mojom::View,
   mojom::ViewClientPtr client_;
   std::unique_ptr<shell::ServiceContextRef> ref_;
 
+  std::unique_ptr<ui::WindowTreeClient> window_tree_client_;
+
   views::WebView* web_view_;
 
   std::unique_ptr<content::WebContents> web_contents_;