Vectorize help icon in Ash system menu for MD

ui/gfx/vector_icons/BUILD.gn

 # Copyright 2014 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.
 
 action("aggregate_vector_icons") {
   visibility = [ ":*" ]
 
   script = "aggregate_vector_icons.py"
 
   icons = [
@@ skipping 36 matching lines @@
     "find_prev.1x.icon",
     "find_prev.icon",
     "folder.1x.icon",
     "folder.icon",
     "folder_managed.1x.icon",
     "folder_managed.icon",
     "folder_supervised.1x.icon",
     "folder_supervised.icon",
     "fullscreen.icon",
     "globe.icon",
-    "help.icon",
     "help_outline.icon",
     "image.icon",
     "incognito.1x.icon",
     "incognito.icon",
     "info_outline.icon",
     "laptop.icon",
     "location_bar_http.1x.icon",
     "location_bar_http.icon",
     "location_bar_https_invalid.1x.icon",
     "location_bar_https_invalid.icon",
@@ skipping 167 matching lines @@
     "../vector_icon_types.h",
     "../vector_icons_public.h",
   ]
 
   deps = [
     ":aggregate_vector_icons",
     "//base",
     "//skia",
   ]
 }