[gnome-boxes/wip/jimmac/no-custom-nightly-css] theme: remove custom nightly styling

[Jakub Steiner <jimmac src gnome org>]

commit 8d1250064c46c359605288a27f3913cc21c584c9
Author: Jakub Steiner <jimmac gmail com>
Date:   Wed Oct 10 08:56:08 2018 +0200

    theme: remove custom nightly styling
    
    - adwaita already has the appropriate styling
      for nightlies

 data/gtk-style.css | 6 ------
 1 file changed, 6 deletions(-)
---
diff --git a/data/gtk-style.css b/data/gtk-style.css
index 27991159..72e80d7b 100644
--- a/data/gtk-style.css
+++ b/data/gtk-style.css
@@ -106,9 +106,3 @@
     animation-duration: 150ms;
     animation-iteration-count: 1;
 }
-
-/* Visual hint for development versions */
-.devel headerbar {
-    background: -gtk-icontheme("system-run-symbolic") 80% 0/64px 64px no-repeat,
-                linear-gradient(to left, #387e41 0%, #387e41 30%, @theme_bg_color 55%);
-}