[gnome-shell] slider: Don't hardcode scroll interval for smooth scrolling

[Adel Gadllah <agadllah src gnome org>]

commit e3a8a284a4f69e4bcd324acf5e537d057e7c6785
Author: Adel Gadllah <adel gadllah gmail com>
Date:   Sat Jan 10 13:12:48 2015 +0100

    slider: Don't hardcode scroll interval for smooth scrolling
    
    Use the SLIDER_SCROLL_STEP constant instead for consistency.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=742648

 js/ui/slider.js |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/js/ui/slider.js b/js/ui/slider.js
index 383dca4..8844d9a 100644
--- a/js/ui/slider.js
+++ b/js/ui/slider.js
@@ -197,7 +197,7 @@ const Slider = new Lang.Class({
             let [dx, dy] = event.get_scroll_delta();
             // Even though the slider is horizontal, use dy to match
             // the UP/DOWN above.
-            delta = -dy / 10;
+            delta = -dy * SLIDER_SCROLL_STEP;
         }
 
         this._value = Math.min(Math.max(0, this._value + delta), 1);