Remove now-unnecessary wrappers around gfx::Screen::GetScreen()

ash/shell/toplevel_window.cc

Index: ash/shell/toplevel_window.cc
diff --git a/ash/shell/toplevel_window.cc b/ash/shell/toplevel_window.cc
index ef28e5d071bd0b58630f07391b76815ddad29619..61c7daf48a7d9042c132ee6a28b8f015d47e4333 100644
--- a/ash/shell/toplevel_window.cc
+++ b/ash/shell/toplevel_window.cc
@@ -84,11 +84,7 @@ bool ToplevelWindow::GetSavedWindowPlacement(
     bounds->SetRect(10, 150, 300, 300);
   }
   ash::WindowPositioner::GetBoundsAndShowStateForNewWindow(
-      ash::Shell::GetScreen(),
-      NULL,
-      is_saved_bounds,
-      *show_state,
-      bounds,
+      gfx::Screen::GetScreen(), NULL, is_saved_bounds, *show_state, bounds,
       show_state);
   return true;
 }