[gtk/kill-buttonbox] Drop buttonbox from tests

[Matthias Clasen <matthiasc src gnome org>]

commit de4703ebfa25a19a9f8883fa843e7b80829b4aa8
Author: Matthias Clasen <mclasen redhat com>
Date:   Tue Feb 5 07:40:43 2019 -0500

    Drop buttonbox from tests

 testsuite/gtk/builder.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
---
diff --git a/testsuite/gtk/builder.c b/testsuite/gtk/builder.c
index 2837c4a4ce..80d8ef5e77 100644
--- a/testsuite/gtk/builder.c
+++ b/testsuite/gtk/builder.c
@@ -922,7 +922,7 @@ test_children (void)
     "      <object class=\"GtkBox\" id=\"dialog1-vbox\">"
     "        <property name=\"orientation\">vertical</property>"
     "          <child internal-child=\"action_area\">"
-    "            <object class=\"GtkButtonBox\" id=\"dialog1-action_area\">"
+    "            <object class=\"GtkBox\" id=\"dialog1-action_area\">"
     "              <property name=\"orientation\">horizontal</property>"
     "            </object>"
     "          </child>"
@@ -1324,7 +1324,7 @@ test_dialog (void)
     "      <object class=\"GtkBox\" id=\"dialog1-vbox\">"
     "        <property name=\"orientation\">vertical</property>"
     "          <child internal-child=\"action_area\">"
-    "            <object class=\"GtkButtonBox\" id=\"dialog1-action_area\">"
+    "            <object class=\"GtkBox\" id=\"dialog1-action_area\">"
     "              <property name=\"orientation\">horizontal</property>"
     "              <child>"
     "                <object class=\"GtkButton\" id=\"button_cancel\"/>"
@@ -2179,7 +2179,7 @@ test_message_area (void)
     "      </object>"
     "    </child>"
     "    <child internal-child=\"action_area\">"
-    "      <object class=\"GtkButtonBox\" id=\"actionarea1\">"
+    "      <object class=\"GtkBox\" id=\"actionarea1\">"
     "       <property name=\"orientation\">vertical</property>"
     "        <child>"
     "          <object class=\"GtkButton\" id=\"button_ok\">"
@@ -2420,7 +2420,7 @@ test_no_ids (void)
     "      </object>"
     "    </child>"
     "    <child internal-child=\"action_area\">"
-    "      <object class=\"GtkButtonBox\">"
+    "      <object class=\"GtkBox\">"
     "       <property name=\"orientation\">vertical</property>"
     "        <child>"
     "          <object class=\"GtkButton\" id=\"button_ok\">"