[gnome-calculator] Remove deprecated modify_bg code that doesn't seem to do anything anyway

[Robert Ancell <rancell src gnome org>]

commit a6e6a1d94a36950df8776e38218fe349a9818ae5
Author: Robert Ancell <robert ancell canonical com>
Date:   Tue Oct 15 10:36:15 2013 +1300

    Remove deprecated modify_bg code that doesn't seem to do anything anyway

 src/math-display.vala |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)
---
diff --git a/src/math-display.vala b/src/math-display.vala
index a466f26..d366474 100644
--- a/src/math-display.vala
+++ b/src/math-display.vala
@@ -65,9 +65,6 @@ public class MathDisplay : Gtk.Viewport
 
         spinner = new Gtk.Spinner ();
         info_box.pack_end (spinner, false, false, 0);
-        style = info_view.get_style ();
-        for (var i = 0; i < 5; i++)
-            modify_bg (i, style.base[i]);
 
         info_box.show ();
         info_view.show ();