mus: Changes SetDisplayRoot() to create actual display

services/ui/display/screen_manager_forwarding.cc

Index: services/ui/display/screen_manager_forwarding.cc
diff --git a/services/ui/display/screen_manager_forwarding.cc b/services/ui/display/screen_manager_forwarding.cc
index c3bfd521b9c52e7e763a0db0e4ef878eacea8137..667f2bcd564f737200a77aedd4fd56e4d3c0aaef 100644
--- a/services/ui/display/screen_manager_forwarding.cc
+++ b/services/ui/display/screen_manager_forwarding.cc
@@ -35,9 +35,6 @@ const DisplayMode* GetCorrespondingMode(const DisplaySnapshot& snapshot,
 
 }  // namespace
 
-// TODO(sky/kylechar): Change ScreenManager::Create() to make a
-// ScreenManagerForwarding in mus mode.
-
 ScreenManagerForwarding::ScreenManagerForwarding() : binding_(this) {}
 
 ScreenManagerForwarding::~ScreenManagerForwarding() {