[gtk] cssnode: Remove unused struct

[Timm Bäder <baedert src gnome org>]

commit b9316a404ab38c304a125776d4dbcd1ba21787eb
Author: Timm Bäder <mail baedert org>
Date:   Sat Aug 24 08:49:24 2019 +0200

    cssnode: Remove unused struct

 gtk/gtkcssnode.c | 5 -----
 1 file changed, 5 deletions(-)
---
diff --git a/gtk/gtkcssnode.c b/gtk/gtkcssnode.c
index 8bcf5faa92..039791e873 100644
--- a/gtk/gtkcssnode.c
+++ b/gtk/gtkcssnode.c
@@ -106,11 +106,6 @@ enum {
   NUM_PROPERTIES
 };
 
-struct _GtkCssNodeStyleChange {
-  GtkCssStyle *old_style;
-  GtkCssStyle *new_style;
-};
-
 static guint cssnode_signals[LAST_SIGNAL] = { 0 };
 static GParamSpec *cssnode_properties[NUM_PROPERTIES];