Move more vector icons into respective directories.

ui/gfx/vector_icons/tablet.icon

Index: ui/gfx/vector_icons/tablet.icon
diff --git a/ui/gfx/vector_icons/tablet.icon b/ui/gfx/vector_icons/tablet.icon
deleted file mode 100644
index 121bfd49994b1ec728a1b2fef2b508461e2d15da..0000000000000000000000000000000000000000
--- a/ui/gfx/vector_icons/tablet.icon
+++ /dev/null
@@ -1,21 +0,0 @@
-// Copyright 2015 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.
-
-MOVE_TO, 42, 8,
-H_LINE_TO, 6,
-R_CUBIC_TO, -2.21f, 0, -4, 1.79f, -4, 4,
-R_V_LINE_TO, 24,
-R_CUBIC_TO, 0, 2.21f, 1.79f, 4, 4, 4,
-R_H_LINE_TO, 36,
-R_CUBIC_TO, 2.21f, 0, 3.98f, -1.79f, 3.98f, -4,
-LINE_TO, 46, 12,
-R_CUBIC_TO, 0, -2.21f, -1.79f, -4, -4, -4,
-CLOSE,
-R_MOVE_TO, -4, 28,
-H_LINE_TO, 10,
-V_LINE_TO, 12,
-R_H_LINE_TO, 28,
-R_V_LINE_TO, 24,
-CLOSE,
-END