mash: Disable ash_sysui; begin removal.

ash/public/interfaces/wallpaper.mojom

 // 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.sysui.mojom;
+module ash.mojom;
 
 import "skia/public/interfaces/bitmap.mojom";
 
 // These values match wallpaper::WallpaperLayout.
 enum WallpaperLayout { CENTER, CENTER_CROPPED, STRETCH, TILE, };
 
-// Used by Chrome to set the wallpaper displayed by ash_sysui.
+// Used by Chrome to set the wallpaper displayed by ash.
 interface WallpaperController {
   SetWallpaper(skia.mojom.Bitmap wallpaper, WallpaperLayout layout);
 };
 
-// Used by ash_sysui to trigger Chrome's wallpaper picker functionality.
+// Used by ash to trigger Chrome's wallpaper picker functionality.
 interface WallpaperManager {
   Open();
 };