MD - update checkbox and radio buttons

ui/gfx/vector_icons/checkbox_normal.icon

Index: ui/gfx/vector_icons/checkbox_normal.icon
diff --git a/ui/gfx/vector_icons/checkbox_normal.icon b/ui/gfx/vector_icons/checkbox_normal.icon
new file mode 100644
index 0000000000000000000000000000000000000000..aa9aae8a64a34e3ec58804ddd609f134e9554791
--- /dev/null
+++ b/ui/gfx/vector_icons/checkbox_normal.icon
@@ -0,0 +1,22 @@
+// 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, 2, 3.99f,
+CUBIC_TO, 2, 2.89f, 2.9f, 2, 3.99f, 2,
+R_H_LINE_TO, 24.02f,
+CUBIC_TO, 29.11f, 2, 30, 2.9f, 30, 3.99f,
+R_V_LINE_TO, 24.02f,
+R_CUBIC_TO, 0, 1.1f, -0.9f, 1.99f, -1.99f, 1.99f,
+H_LINE_TO, 3.99f,
+CUBIC_TO, 2.89f, 30, 2, 29.1f, 2, 28.01f,
+V_LINE_TO, 3.99f,
+CLOSE,
+MOVE_TO, 5, 5,
+R_H_LINE_TO, 22,
+R_V_LINE_TO, 22,
+H_LINE_TO, 5,
+V_LINE_TO, 5,
+CLOSE,
+END