Move a bunch of ash-only vector icons to ash/.

ui/gfx/vector_icons/system_tray_update.icon

Index: ui/gfx/vector_icons/system_tray_update.icon
diff --git a/ui/gfx/vector_icons/system_tray_update.icon b/ui/gfx/vector_icons/system_tray_update.icon
deleted file mode 100644
index 90c39b1bd664624125bc3851627972b39bf969eb..0000000000000000000000000000000000000000
--- a/ui/gfx/vector_icons/system_tray_update.icon
+++ /dev/null
@@ -1,21 +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.
-
-CANVAS_DIMENSIONS, 32,
-MOVE_TO, 16, 29,
-R_CUBIC_TO, 7.18f, 0, 13, -5.82f, 13, -13,
-CUBIC_TO, 29, 8.82f, 23.18f, 3, 16, 3,
-CUBIC_TO, 8.82f, 3, 3, 8.82f, 3, 16,
-R_CUBIC_TO, 0, 7.18f, 5.82f, 13, 13, 13,
-CLOSE,
-R_MOVE_TO, -3, -7,
-R_H_LINE_TO, 6,
-R_V_LINE_TO, -5,
-R_H_LINE_TO, 3,
-R_LINE_TO, -6, -7,
-R_LINE_TO, -6, 7,
-R_H_LINE_TO, 3,
-R_V_LINE_TO, 5,
-CLOSE,
-END