Disable mute/unmute when media does not have an audio track.

chrome/common/render_messages.h

Index: chrome/common/render_messages.h
diff --git a/chrome/common/render_messages.h b/chrome/common/render_messages.h
index ee8c7516d7a922bde627b71e2fe3e8941921b032..af0e9014d562cdbb35ab6046740732a9901070ca 100644
--- a/chrome/common/render_messages.h
+++ b/chrome/common/render_messages.h
@@ -879,10 +879,12 @@ struct ParamTraits<ContextMenuMediaParams> {
   typedef ContextMenuMediaParams param_type;
   static void Write(Message* m, const param_type& p) {
     WriteParam(m, p.player_state);
+    WriteParam(m, p.has_audio);
   }
   static bool Read(const Message* m, void** iter, param_type* p) {
     return
-      ReadParam(m, iter, &p->player_state);
+      ReadParam(m, iter, &p->player_state) &&
+      ReadParam(m, iter, &p->has_audio);
   }
 };