[gnome-shell] volume: Remove unused method

[Florian Müllner <fmuellner src gnome org>]

commit 5545e84430f44a42c84fc0b6a6e5314f6df1d4c5
Author: verdre <verdre v0yd nl>
Date:   Sat Feb 2 18:55:11 2019 +0100

    volume: Remove unused method
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/385

 js/ui/status/volume.js | 5 -----
 1 file changed, 5 deletions(-)
---
diff --git a/js/ui/status/volume.js b/js/ui/status/volume.js
index 6c9e3d08d..64eeccf19 100644
--- a/js/ui/status/volume.js
+++ b/js/ui/status/volume.js
@@ -99,11 +99,6 @@ var StreamSlider = class {
         return this._slider.scroll(event);
     }
 
-    setValue(value) {
-        // piggy-back off of sliderChanged
-        this._slider.setValue(value);
-    }
-
     _sliderChanged(slider, value) {
         if (!this._stream)
             return;