[epiphany] Volume icon should not be "clickable"

[Michael Catanzaro <mcatanzaro src gnome org>]

commit a48d8eea97e6cbcb8b37e8b278e5f16f44e7e900
Author: Jan-Michael Brummer <jan brummer tabos org>
Date:   Thu May 2 10:15:56 2019 +0200

    Volume icon should not be "clickable"
    
    As long as we don't have an action in webkit yet, set it as a simple image instead of a button.
    
    Fixes: https://gitlab.gnome.org/GNOME/epiphany/issues/751

 src/resources/gtk/tab-label.ui | 14 ++++----------
 1 file changed, 4 insertions(+), 10 deletions(-)
---
diff --git a/src/resources/gtk/tab-label.ui b/src/resources/gtk/tab-label.ui
index 27c719b30..3fa1527af 100644
--- a/src/resources/gtk/tab-label.ui
+++ b/src/resources/gtk/tab-label.ui
@@ -2,11 +2,6 @@
 <!-- Generated with glade 3.22.1 -->
 <interface>
   <requires lib="gtk+" version="3.20"/>
-  <object class="GtkImage" id="audio_button_image">
-    <property name="visible">True</property>
-    <property name="can_focus">False</property>
-    <property name="icon_name">audio-volume-high-symbolic</property>
-  </object>
   <object class="GtkImage" id="close_button_image">
     <property name="visible">True</property>
     <property name="can_focus">False</property>
@@ -72,11 +67,10 @@
       </packing>
     </child>
     <child>
-      <object class="GtkButton" id="audio_button">
-        <property name="can_focus">True</property>
-        <property name="receives_default">True</property>
-        <property name="image">audio_button_image</property>
-        <property name="relief">none</property>
+      <object class="GtkImage" id="audio_button">
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+        <property name="icon_name">audio-volume-high-symbolic</property>
       </object>
       <packing>
         <property name="expand">False</property>