Add policy for ash launcher auto-hide behavior

ash/root_window_controller.h

Index: ash/root_window_controller.h
diff --git a/ash/root_window_controller.h b/ash/root_window_controller.h
index b34124efc63ed860bf5ceef3cbac1ac6b3031c6b..842c987c851502756be1481b4dd499d7f2e60fd7 100644
--- a/ash/root_window_controller.h
+++ b/ash/root_window_controller.h
@@ -152,10 +152,6 @@ class ASH_EXPORT RootWindowController {
   bool SetShelfAlignment(ShelfAlignment alignment);
   ShelfAlignment GetShelfAlignment();
 
-  // Get the shelf's auto hide status.
-  bool IsShelfAutoHideMenuHideChecked();
-  ShelfAutoHideBehavior GetToggledShelfAutoHideBehavior();
-
  private:
   // Creates each of the special window containers that holds windows of various
   // types in the shell UI.