Remove code that was only used by navigator.connect.

content/public/browser/message_port_delegate.h

Index: content/public/browser/message_port_delegate.h
diff --git a/content/public/browser/message_port_delegate.h b/content/public/browser/message_port_delegate.h
index 7c2de5bbde639534b86580c13f5e01eb696a6a1a..4364ba7af9a16fd86bf22340f8fcb15f13279ad3 100644
--- a/content/public/browser/message_port_delegate.h
+++ b/content/public/browser/message_port_delegate.h
@@ -16,8 +16,6 @@
 #endif
 
 namespace content {
-struct MessagePortMessage;
-struct TransferredMessagePort;
 
 // Delegate used by MessagePortService to send messages to message ports to the
 // correct renderer. Delegates are responsible for managing their own lifetime,
@@ -29,8 +27,8 @@ class CONTENT_EXPORT MessagePortDelegate {
   // updating MessagePortService with new routes for the sent message ports.
   virtual void SendMessage(
       int route_id,
-      const MessagePortMessage& message,
-      const std::vector<TransferredMessagePort>& sent_message_ports) = 0;
+      const base::string16& message,
+      const std::vector<int>& sent_message_ports) = 0;
 
   // Requests messages to the given route to be queued.
   virtual void SendMessagesAreQueued(int route_id) = 0;