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

ui/gfx/vector_icons/system_menu_accessibility.icon

Index: ui/gfx/vector_icons/system_menu_accessibility.icon
diff --git a/ui/gfx/vector_icons/system_menu_accessibility.icon b/ui/gfx/vector_icons/system_menu_accessibility.icon
deleted file mode 100644
index 11bae49831d64fbd158e0e3a0ab2e09bc3352a52..0000000000000000000000000000000000000000
--- a/ui/gfx/vector_icons/system_menu_accessibility.icon
+++ /dev/null
@@ -1,25 +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, 40,
-MOVE_TO, 20, 13,
-R_CUBIC_TO, -4.72f, -0.37f, -9.82f, -0.86f, -14, -2,
-R_LINE_TO, -1, 3,
-R_CUBIC_TO, 3.1f, 1.06f, 6.67f, 1.6f, 10, 2,
-R_V_LINE_TO, 20,
-R_H_LINE_TO, 3,
-V_LINE_TO, 26,
-R_H_LINE_TO, 4,
-R_V_LINE_TO, 10,
-R_H_LINE_TO, 3,
-V_LINE_TO, 16,
-R_CUBIC_TO, 3.33f, -0.4f, 6.9f, -0.94f, 10, -2,
-R_LINE_TO, -1, -3,
-R_CUBIC_TO, -4.18f, 1.14f, -9.28f, 1.63f, -14, 2,
-CLOSE,
-R_MOVE_TO, 0, -2,
-R_ARC_TO, 3.5f, 3.5f, 0, 1, 0, 0, -7,
-R_ARC_TO, 3.5f, 3.5f, 0, 0, 0, 0, 7,
-CLOSE,
-END