mash: Disable ash_sysui; begin removal.

ash/public/interfaces/shelf_layout.mojom

Index: ash/public/interfaces/shelf_layout.mojom
diff --git a/ash/public/interfaces/shelf_layout.mojom b/ash/public/interfaces/shelf_layout.mojom
deleted file mode 100644
index 529f92f804e0d37e257ab5b769faa58d5b619ff7..0000000000000000000000000000000000000000
--- a/ash/public/interfaces/shelf_layout.mojom
+++ /dev/null
@@ -1,14 +0,0 @@
-// Copyright 2016 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-module ash.mojom;
-
-import "mash/shelf/public/interfaces/shelf_constants.mojom";
-
-// Used by mojo:ash_sysui to push the current shelf state to its layout manager.
-interface ShelfLayout {
-  // TODO: Update preferred sizes with alignment to avoid flicker during layout.
-  SetAlignment(mash.shelf.mojom.Alignment alignment);
-  SetAutoHideBehavior(mash.shelf.mojom.AutoHideBehavior auto_hide);
-};