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

ui/gfx/vector_icons/system_tray_accessibility.icon

Index: ui/gfx/vector_icons/system_tray_accessibility.icon
diff --git a/ui/gfx/vector_icons/system_tray_accessibility.icon b/ui/gfx/vector_icons/system_tray_accessibility.icon
deleted file mode 100644
index 8c3f1ce7ca5feaf6aee58a9fc8faeb154725ef73..0000000000000000000000000000000000000000
--- a/ui/gfx/vector_icons/system_tray_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, 32,
-MOVE_TO, 16, 11.44f,
-R_CUBIC_TO, -3.5f, 0, -7.2f, -0.62f, -10.27f, -1.44f,
-LINE_TO, 5, 12.16f,
-R_CUBIC_TO, 2.27f, 0.77f, 5.56f, 1.05f, 8, 1.34f,
-V_LINE_TO, 28,
-R_H_LINE_TO, 2,
-R_V_LINE_TO, -7,
-R_H_LINE_TO, 2,
-R_V_LINE_TO, 7,
-R_H_LINE_TO, 2,
-V_LINE_TO, 13.5f,
-R_CUBIC_TO, 2.44f, -0.29f, 5.73f, -0.57f, 8, -1.34f,
-LINE_TO, 26.27f, 10,
-R_CUBIC_TO, -3.07f, 0.82f, -6.77f, 1.44f, -10.27f, 1.44f,
-CLOSE,
-R_MOVE_TO, 0, -1.94f,
-R_ARC_TO, 2.5f, 2.5f, 0, 1, 0, 0, -5,
-R_ARC_TO, 2.5f, 2.5f, 0, 0, 0, 0, 5,
-CLOSE,
-END