Fix (attempt) for crbug.com/459115.

content/browser/message_port_message_filter.h

Index: content/browser/message_port_message_filter.h
diff --git a/content/browser/message_port_message_filter.h b/content/browser/message_port_message_filter.h
index 5e0286a02d759f45ed58e92e1e1a8b2e5321266c..ec6fba0679bc55c656d9ee9f1f18a43de8edf5a6 100644
--- a/content/browser/message_port_message_filter.h
+++ b/content/browser/message_port_message_filter.h
@@ -15,6 +15,8 @@
 #undef SendMessage
 #endif
 
+struct ViewMsg_PostMessage_Params;
+
 namespace content {
 
 // Filter for MessagePort related IPC messages (creating and destroying a
@@ -48,6 +50,10 @@ class CONTENT_EXPORT MessagePortMessageFilter
       const std::vector<int>& message_port_ids,
       std::vector<int>* new_routing_ids);
 
+  void RouteMessageEventWithMessagePorts(
+      int routing_id,
+      const ViewMsg_PostMessage_Params& params);
+
  protected:
   // This is protected, so we can define sub classes for testing.
   ~MessagePortMessageFilter() override;