mash: Disable ash_sysui; begin removal.

ash/mus/root_window_controller.h

Index: ash/mus/root_window_controller.h
diff --git a/ash/mus/root_window_controller.h b/ash/mus/root_window_controller.h
index e00c4604ab024a97d5c4a0f23c545e445f576a26..ae1f013a5ced37a998538a297e57a34cc16720c8 100644
--- a/ash/mus/root_window_controller.h
+++ b/ash/mus/root_window_controller.h
@@ -27,8 +27,6 @@ class WorkspaceLayoutManager;
 namespace mus {
 
 class LayoutManager;
-class ShelfLayoutManager;
-class StatusLayoutManager;
 class WindowManager;
 class WmRootWindowControllerMus;
 class WmShelfMus;
@@ -64,8 +62,6 @@ class RootWindowController : public ShelfLayoutManagerDelegate {
 
   const display::Display& display() const { return display_; }
 
-  ShelfLayoutManager* GetShelfLayoutManager();
-  StatusLayoutManager* GetStatusLayoutManager();
   WorkspaceLayoutManager* workspace_layout_manager() {
     return workspace_layout_manager_;
   }