Changes ownership of WindowTreeClient

services/ui/public/cpp/window_tree_host_factory.h

Index: services/ui/public/cpp/window_tree_host_factory.h
diff --git a/services/ui/public/cpp/window_tree_host_factory.h b/services/ui/public/cpp/window_tree_host_factory.h
index 2f638865b8359fb7fd4cf3e241309767ed0f0f51..e21f39c080fcc33042bb12caeefbd70926875e9d 100644
--- a/services/ui/public/cpp/window_tree_host_factory.h
+++ b/services/ui/public/cpp/window_tree_host_factory.h
@@ -18,19 +18,22 @@ class Connector;
 namespace ui {
 
 class WindowManagerDelegate;
+class WindowTreeClient;
 class WindowTreeClientDelegate;
 
 // The following create a new window tree host. Supply a |factory| if you have
 // already connected to mus, otherwise supply |shell|, which contacts mus and
 // obtains a WindowTreeHostFactory.
-void CreateWindowTreeHost(mojom::WindowTreeHostFactory* factory,
-                          WindowTreeClientDelegate* delegate,
-                          mojom::WindowTreeHostPtr* host,
-                          WindowManagerDelegate* window_manager_delegate);
-void CreateWindowTreeHost(shell::Connector* connector,
-                          WindowTreeClientDelegate* delegate,
-                          mojom::WindowTreeHostPtr* host,
-                          WindowManagerDelegate* window_manager_delegate);
+std::unique_ptr<WindowTreeClient> CreateWindowTreeHost(
+    mojom::WindowTreeHostFactory* factory,
+    WindowTreeClientDelegate* delegate,
+    mojom::WindowTreeHostPtr* host,
+    WindowManagerDelegate* window_manager_delegate);
+std::unique_ptr<WindowTreeClient> CreateWindowTreeHost(
+    shell::Connector* connector,
+    WindowTreeClientDelegate* delegate,
+    mojom::WindowTreeHostPtr* host,
+    WindowManagerDelegate* window_manager_delegate);
 
 }  // namespace ui