Rename RootWindowHost to WindowTreeHost

ui/views/widget/desktop_aura/desktop_root_window_host_ozone.cc

Index: ui/views/widget/desktop_aura/desktop_root_window_host_ozone.cc
diff --git a/ui/views/widget/desktop_aura/desktop_root_window_host_ozone.cc b/ui/views/widget/desktop_aura/desktop_root_window_host_ozone.cc
index ffca2a6337c55dfbd1ff0a8cf6dbc15ee9c76966..e327cb1a8d3cab6c28d527e1faab3b320796526d 100644
--- a/ui/views/widget/desktop_aura/desktop_root_window_host_ozone.cc
+++ b/ui/views/widget/desktop_aura/desktop_root_window_host_ozone.cc
@@ -8,12 +8,12 @@
 
 namespace views {
 
-DesktopRootWindowHost* DesktopRootWindowHost::Create(
+DesktopWindowTreeHost* DesktopWindowTreeHost::Create(
     internal::NativeWidgetDelegate* native_widget_delegate,
     DesktopNativeWidgetAura* desktop_native_widget_aura) {
   DesktopFactoryOzone* d_factory = DesktopFactoryOzone::GetInstance();
 
-  return d_factory->CreateRootWindowHost(native_widget_delegate,
+  return d_factory->CreateWindowTreeHost(native_widget_delegate,
                                          desktop_native_widget_aura);
 }