[gtk+] Drop the env var for scrolling control

[Matthias Clasen <matthiasc src gnome org>]

commit e49615184a9d85bb0bb4e289b3ee8252adee3813
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Oct 7 18:27:51 2017 -0400

    Drop the env var for scrolling control
    
    This was never meant to be an official api, but rather
    a transition help. Time to drop it for GTK+ 4.

 gtk/gtkscrolledwindow.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)
---
diff --git a/gtk/gtkscrolledwindow.c b/gtk/gtkscrolledwindow.c
index 021ebf6..a9a2061 100644
--- a/gtk/gtkscrolledwindow.c
+++ b/gtk/gtkscrolledwindow.c
@@ -3891,9 +3891,6 @@ gtk_scrolled_window_update_use_indicators (GtkScrolledWindow *scrolled_window)
 
   use_indicators = priv->overlay_scrolling;
 
-  if (g_strcmp0 (g_getenv ("GTK_OVERLAY_SCROLLING"), "0") == 0)
-    use_indicators = FALSE;
-
   if (priv->use_indicators != use_indicators)
     {
       priv->use_indicators = use_indicators;