Move more vector icons into respective directories.

ui/gfx/vector_icons/shelf_logout.icon

Index: ui/gfx/vector_icons/shelf_logout.icon
diff --git a/ui/gfx/vector_icons/shelf_logout.icon b/ui/gfx/vector_icons/shelf_logout.icon
deleted file mode 100644
index d695acc8d9e89988f51ffeedb5e6c43fd1248c4a..0000000000000000000000000000000000000000
--- a/ui/gfx/vector_icons/shelf_logout.icon
+++ /dev/null
@@ -1,35 +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, 16.48f, 24,
-LINE_TO, 24, 16.5f,
-LINE_TO, 16.48f, 9,
-LINE_TO, 14, 11.5f,
-R_LINE_TO, 3.5f, 3.5f,
-H_LINE_TO, 3,
-R_V_LINE_TO, 3,
-R_H_LINE_TO, 14.5f,
-LINE_TO, 14, 21.5f,
-R_LINE_TO, 2.48f, 2.5f,
-CLOSE,
-MOVE_TO, 6, 3,
-CUBIC_TO, 4.15f, 3, 3, 4.5f, 3, 6.33f,
-V_LINE_TO, 11,
-R_H_LINE_TO, 3,
-V_LINE_TO, 6.01f,
-R_H_LINE_TO, 20,
-R_V_LINE_TO, 20.02f,
-H_LINE_TO, 6,
-V_LINE_TO, 22,
-H_LINE_TO, 3,
-R_V_LINE_TO, 3.67f,
-CUBIC_TO, 3, 27.5f, 4.48f, 29, 6.33f, 29,
-R_H_LINE_TO, 19.33f,
-CUBIC_TO, 27.5f, 29, 29, 27.5f, 29, 25.67f,
-V_LINE_TO, 6.33f,
-CUBIC_TO, 29, 4.5f, 27.5f, 3, 25.67f, 3,
-H_LINE_TO, 6,
-CLOSE,
-END