Remove SocketData and now only pass the dart port to epoll.

runtime/bin/eventhandler_macos.h

Index: runtime/bin/eventhandler_macos.h
diff --git a/runtime/bin/eventhandler_macos.h b/runtime/bin/eventhandler_macos.h
index 96865669c050e5ad4f5333e904decf2197719e3a..acbfc9177103eeec45db304d6a9243a816a86dfb 100644
--- a/runtime/bin/eventhandler_macos.h
+++ b/runtime/bin/eventhandler_macos.h
@@ -89,7 +89,7 @@ class EventHandlerImplementation {
   // Gets the socket data structure for a given file
   // descriptor. Creates a new one if one is not found.
   SocketData* GetSocketData(intptr_t fd, bool* is_new);
-  void SendData(intptr_t id, Dart_Port dart_port, int64_t data);
+  void Notify(intptr_t id, Dart_Port dart_port, int64_t data);
   void Start(EventHandler* handler);
   void Shutdown();