Moves RootWindowController::MoveWindowsTo to WmRootWindowController

ash/common/wm_root_window_controller.h

Index: ash/common/wm_root_window_controller.h
diff --git a/ash/common/wm_root_window_controller.h b/ash/common/wm_root_window_controller.h
index 5a9615a671ff830128cbf6003f98c51e8bbc1048..ab44458a8b20b200e6f8c788d81ebf7b0bc75ea6 100644
--- a/ash/common/wm_root_window_controller.h
+++ b/ash/common/wm_root_window_controller.h
@@ -119,6 +119,9 @@ class ASH_EXPORT WmRootWindowController {
   virtual void OnWallpaperAnimationFinished(views::Widget* widget);
 
  protected:
+  // Moves child windows to |dest|.
+  void MoveWindowsTo(WmWindow* dest);
+
   // Creates the containers (WmWindows) used by the shell.
   void CreateContainers();