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

ui/gfx/vector_icons/system_tray_volume_mute.icon

Index: ui/gfx/vector_icons/system_tray_volume_mute.icon
diff --git a/ui/gfx/vector_icons/system_tray_volume_mute.icon b/ui/gfx/vector_icons/system_tray_volume_mute.icon
deleted file mode 100644
index e2bbd09480a5a72ed4e9f90ed0ddcee4f83b887c..0000000000000000000000000000000000000000
--- a/ui/gfx/vector_icons/system_tray_volume_mute.icon
+++ /dev/null
@@ -1,42 +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, 22, 16,
-R_ARC_TO, 6, 6, 0, 0, 0, -3.33f, -5.37f,
-R_V_LINE_TO, 2.95f,
-R_LINE_TO, 3.27f, 3.27f,
-R_CUBIC_TO, 0.04f, -0.27f, 0.07f, -0.55f, 0.07f, -0.84f,
-CLOSE,
-R_MOVE_TO, 3.33f, 0,
-R_ARC_TO, 9.12f, 9.12f, 0, 0, 1, -0.72f, 3.52f,
-R_LINE_TO, 2.01f, 2.01f,
-ARC_TO, 11.73f, 11.73f, 0, 0, 0, 28, 16,
-R_CUBIC_TO, 0, -5.71f, -3.99f, -10.48f, -9.33f, -11.69f,
-R_V_LINE_TO, 2.75f,
-CUBIC_TO, 22.52f, 8.2f, 25.33f, 11.77f, 25.33f, 16,
-CLOSE,
-MOVE_TO, 5.69f, 4,
-LINE_TO, 4, 5.69f,
-LINE_TO, 10.31f, 12,
-H_LINE_TO, 4,
-R_V_LINE_TO, 8,
-R_H_LINE_TO, 5.33f,
-LINE_TO, 16, 26.67f,
-R_V_LINE_TO, -8.97f,
-R_LINE_TO, 5.67f, 5.67f,
-R_ARC_TO, 9.23f, 9.23f, 0, 0, 1, -3, 1.57f,
-R_V_LINE_TO, 2.75f,
-R_CUBIC_TO, 1.84f, -0.41f, 3.51f, -1.27f, 4.92f, -2.41f,
-LINE_TO, 26.31f, 28,
-LINE_TO, 28, 26.31f,
-R_LINE_TO, -12, -12,
-LINE_TO, 5.69f, 4,
-CLOSE,
-MOVE_TO, 16, 5.33f,
-LINE_TO, 13.21f, 8.12f,
-LINE_TO, 16, 10.91f,
-V_LINE_TO, 5.33f,
-CLOSE,
-END