[gnome-builder] so i remember to not make these alt+arrows this time

[Christian Hergert <chergert src gnome org>]

commit 5535589e5718491c316b6ddc4d563434330aee75
Author: Christian Hergert <christian hergert me>
Date:   Thu Mar 19 14:03:20 2015 -0700

    so i remember to not make these alt+arrows this time

 data/keybindings/default.css |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/data/keybindings/default.css b/data/keybindings/default.css
index 01a3e5c..5f7681d 100644
--- a/data/keybindings/default.css
+++ b/data/keybindings/default.css
@@ -5,6 +5,8 @@
   bind "<ctrl>f" { "action" ("frame", "find", "") };
   bind "<ctrl>period" { "action" ("workbench", "global-search", "") };
   bind "<ctrl>s" { "action" ("view", "save", "") };
+  bind "<alt><shift>left" { "action" ("navigation", "go-backward", "") };
+  bind "<alt><shift>right" { "action" ("navigation", "go-forward", "") };
 }
 
 IdeSourceViewMode.default {