Privatize StrongBinding lifetime management

services/ui/ws/window_tree_factory.cc

Index: services/ui/ws/window_tree_factory.cc
diff --git a/services/ui/ws/window_tree_factory.cc b/services/ui/ws/window_tree_factory.cc
index bc4519f203c8fdfcbdff619d564fa5db30f24992..ea43c401ebd268c8ca4cea5b1872c8bcf54a9fca 100644
--- a/services/ui/ws/window_tree_factory.cc
+++ b/services/ui/ws/window_tree_factory.cc
@@ -15,12 +15,10 @@ namespace ws {
 
 WindowTreeFactory::WindowTreeFactory(WindowServer* window_server,
                                      const UserId& user_id,
-                                     const std::string& client_name,
-                                     mojom::WindowTreeFactoryRequest request)
+                                     const std::string& client_name)
     : window_server_(window_server),
       user_id_(user_id),
-      client_name_(client_name),
-      binding_(this, std::move(request)) {}
+      client_name_(client_name) {}
 
 WindowTreeFactory::~WindowTreeFactory() {}