[rhythmbox] header: remove hacks for old versions of gtk

[Jonathan Matthew <jmatthew src gnome org>]

commit 338e1dcdcbcb4071e7cc35e0e72babb702f5a631
Author: Jonathan Matthew <jonathan d14n org>
Date:   Wed Jun 15 19:42:30 2016 +1000

    header: remove hacks for old versions of gtk

 widgets/rb-header.c |   16 +---------------
 1 files changed, 1 insertions(+), 15 deletions(-)
---
diff --git a/widgets/rb-header.c b/widgets/rb-header.c
index bf4ac27..c47e936 100644
--- a/widgets/rb-header.c
+++ b/widgets/rb-header.c
@@ -1032,16 +1032,7 @@ slider_press_callback (GtkWidget *widget,
        header->priv->latest_set_time = -1;
        g_object_notify (G_OBJECT (header), "slider-dragging");
 
-#if !GTK_CHECK_VERSION(3,5,0)
-       /* HACK: we want the behaviour you get with the middle button, so we
-        * mangle the event.  clicking with other buttons moves the slider in
-        * step increments, clicking with the middle button moves the slider to
-        * the location of the click.
-        */
-       event->button = 2;
-#endif
-
-       /* more hack: pretend the trough is at least 20 pixels high */
+       /* hack: pretend the trough is at least 20 pixels high */
        height = gtk_widget_get_allocated_height (widget);
        if (abs (event->y - (height / 2)) < 10)
                event->y = height / 2;
@@ -1108,11 +1099,6 @@ slider_release_callback (GtkWidget *widget,
                         GdkEventButton *event,
                         RBHeader *header)
 {
-#if !GTK_CHECK_VERSION(3,5,0)
-       /* HACK: see slider_press_callback */
-       event->button = 2;
-#endif
-
        if (header->priv->slider_dragging == FALSE) {
                rb_debug ("slider is not dragging");
                return FALSE;