Revert 236048 "Rename RootWindowHost* to WindowTreeHost*"

trunk/src/ui/views/widget/desktop_aura/x11_desktop_handler.cc

Index: trunk/src/ui/views/widget/desktop_aura/x11_desktop_handler.cc
===================================================================
--- trunk/src/ui/views/widget/desktop_aura/x11_desktop_handler.cc	(revision 236092)
+++ trunk/src/ui/views/widget/desktop_aura/x11_desktop_handler.cc	(working copy)
@@ -151,13 +151,13 @@
 void X11DesktopHandler::OnActiveWindowChanged(::Window xid) {
   if (current_window_ == xid)
     return;
-  DesktopWindowTreeHostX11* old_host =
-      views::DesktopWindowTreeHostX11::GetHostForXID(current_window_);
+  DesktopRootWindowHostX11* old_host =
+      views::DesktopRootWindowHostX11::GetHostForXID(current_window_);
   if (old_host)
     old_host->HandleNativeWidgetActivationChanged(false);
 
-  DesktopWindowTreeHostX11* new_host =
-      views::DesktopWindowTreeHostX11::GetHostForXID(xid);
+  DesktopRootWindowHostX11* new_host =
+      views::DesktopRootWindowHostX11::GetHostForXID(xid);
   if (new_host)
     new_host->HandleNativeWidgetActivationChanged(true);