Move ash specific cursor code to CursorManager.

ui/aura/root_window.h

Index: ui/aura/root_window.h
diff --git a/ui/aura/root_window.h b/ui/aura/root_window.h
index 7cd317b8b3869cc0665b2afd0b5cd640e50f3eb4..76e711592f261d7004985aae7d44b94eeac32aba 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -101,13 +101,6 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
 
   static RootWindow* GetForAcceleratedWidget(gfx::AcceleratedWidget widget);
 
-  static void set_hide_host_cursor(bool hide) {
-    hide_host_cursor_ = hide;
-  }
-  static bool hide_host_cursor() {
-    return hide_host_cursor_;
-  }
-
   ui::Compositor* compositor() { return compositor_.get(); }
   gfx::NativeCursor last_cursor() const { return last_cursor_; }
   Window* mouse_pressed_handler() { return mouse_pressed_handler_; }
@@ -367,11 +360,6 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
 
   scoped_ptr<RootWindowHost> host_;
 
-  // If set before the RootWindow is created, the cursor will be drawn within
-  // the Aura root window but hidden outside of it, and it'll remain hidden
-  // after the Aura window is closed.
-  static bool hide_host_cursor_;
-
   // Used to schedule painting.
   base::WeakPtrFactory<RootWindow> schedule_paint_factory_;