Use vector icon for Ash shelf launcher

ui/gfx/vector_icons/shelf_applist.icon

Index: ui/gfx/vector_icons/shelf_applist.icon
diff --git a/ui/gfx/vector_icons/shelf_applist.icon b/ui/gfx/vector_icons/shelf_applist.icon
new file mode 100644
index 0000000000000000000000000000000000000000..abe32bf7a15e0c24cd81d3a4ccae629c7ab37d58
--- /dev/null
+++ b/ui/gfx/vector_icons/shelf_applist.icon
@@ -0,0 +1,26 @@
+// 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, 26,
+MOVE_TO, 9.66f, 16.35f,
+R_ARC_TO, 6.68f, 6.68f, 0, 0, 1, -6.69f, -6.69f,
+R_ARC_TO, 6.68f, 6.68f, 0, 0, 1, 6.69f, -6.69f,
+R_ARC_TO, 6.68f, 6.68f, 0, 0, 1, 6.69f, 6.69f,
+R_ARC_TO, 6.68f, 6.68f, 0, 0, 1, -6.69f, 6.69f,
+CLOSE,
+R_MOVE_TO, 8.92f, 0,
+R_H_LINE_TO, -1.17f,
+R_LINE_TO, -0.42f, -0.4f,
+R_ARC_TO, 9.62f, 9.62f, 0, 0, 0, 2.33f, -6.29f,
+ARC_TO, 9.66f, 9.66f, 0, 0, 0, 9.66f, 0,
+ARC_TO, 9.66f, 9.66f, 0, 0, 0, 0, 9.66f,
+R_ARC_TO, 9.66f, 9.66f, 0, 0, 0, 9.66f, 9.66f,
+R_ARC_TO, 9.62f, 9.62f, 0, 0, 0, 6.29f, -2.33f,
+R_LINE_TO, 0.4f, 0.42f,
+R_V_LINE_TO, 1.17f,
+LINE_TO, 23.79f, 26,
+LINE_TO, 26, 23.79f,
+R_LINE_TO, -7.42f, -7.43f,
+CLOSE,
+END