Remove unused variables, ash/ edition.

ash/sysui/sysui_application.cc

Index: ash/sysui/sysui_application.cc
diff --git a/ash/sysui/sysui_application.cc b/ash/sysui/sysui_application.cc
index 81b2d184605511b33d50c4c31d670ad3a95b95e4..7f22f4782733b622ee0dc5ad9afd92b87d5bd716 100644
--- a/ash/sysui/sysui_application.cc
+++ b/ash/sysui/sysui_application.cc
@@ -220,10 +220,6 @@ class AshInit {
     window_manager_connection_ =
         views::WindowManagerConnection::Create(connector, identity);
 
-    display::Screen* screen = display::Screen::GetScreen();
-    DCHECK(screen);
-    gfx::Size size = screen->GetPrimaryDisplay().bounds().size();
-
     // Uninstall the ScreenMus installed by WindowManagerConnection, so that ash
     // installs and uses the ScreenAsh. This can be removed once ash learns to
     // talk to mus for managing displays.