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

ui/gfx/vector_icons/system_tray_screen_share.icon

Index: ui/gfx/vector_icons/system_tray_screen_share.icon
diff --git a/ui/gfx/vector_icons/system_tray_screen_share.icon b/ui/gfx/vector_icons/system_tray_screen_share.icon
deleted file mode 100644
index 3041e160b05ac1d4d75538bbc0604967ec60a095..0000000000000000000000000000000000000000
--- a/ui/gfx/vector_icons/system_tray_screen_share.icon
+++ /dev/null
@@ -1,28 +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, 28, 20.5f,
-V_LINE_TO, 9,
-R_CUBIC_TO, 0.33f, -1.83f, -0.87f, -3, -2, -3,
-H_LINE_TO, 6,
-CUBIC_TO, 4.85f, 6, 3.67f, 7.17f, 4, 9,
-R_V_LINE_TO, 11.5f,
-R_CUBIC_TO, 0, 1, 1.5f, 2.5f, 2.5f, 2.5f,
-H_LINE_TO, 2,
-R_V_LINE_TO, 3,
-R_H_LINE_TO, 28,
-R_V_LINE_TO, -3,
-R_H_LINE_TO, -4.5f,
-R_CUBIC_TO, 1, 0, 2.5f, -1.5f, 2.5f, -2.5f,
-CLOSE,
-MOVE_TO, 17, 19,
-R_V_LINE_TO, -3,
-R_CUBIC_TO, -3.81f, 0.26f, -6.19f, 1.43f, -8, 4,
-R_CUBIC_TO, 0.73f, -3.67f, 2.74f, -7.33f, 8, -8,
-V_LINE_TO, 9,
-R_LINE_TO, 5, 5,
-R_LINE_TO, -5, 5,
-CLOSE,
-END