[gtk+] switch: Remove .slider from slider gadget

[Timm Bäder <baedert src gnome org>]

commit 0efe186d956bbdb75c7cbef4e95d56ca370d3ee7
Author: Timm Bäder <mail baedert org>
Date:   Wed May 4 18:55:33 2016 +0200

    switch: Remove .slider from slider gadget
    
    As the documentation states, neither the switch nor the slider gadget
    should be using any style classes.

 gtk/gtkswitch.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/gtk/gtkswitch.c b/gtk/gtkswitch.c
index 5ab35c7..b09b3b4 100644
--- a/gtk/gtkswitch.c
+++ b/gtk/gtkswitch.c
@@ -1059,7 +1059,6 @@ gtk_switch_init (GtkSwitch *self)
                                                    gtk_switch_render_slider,
                                                    NULL,
                                                    NULL);
-  gtk_css_gadget_add_class (priv->slider_gadget, GTK_STYLE_CLASS_SLIDER);
 
   gesture = gtk_gesture_multi_press_new (GTK_WIDGET (self));
   gtk_gesture_single_set_touch_only (GTK_GESTURE_SINGLE (gesture), FALSE);