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

runtime/bin/eventhandler_android.cc

Index: runtime/bin/eventhandler_android.cc
diff --git a/runtime/bin/eventhandler_android.cc b/runtime/bin/eventhandler_android.cc
index a5083ad7fb78e10cfc9c29ae720c38be865c70cb..2715a6edd1089b7b33bb8bbe71431e1ae78eee19 100644
--- a/runtime/bin/eventhandler_android.cc
+++ b/runtime/bin/eventhandler_android.cc
@@ -344,13 +344,13 @@ void EventHandlerImplementation::Start(EventHandler* handler) {
 
 
 void EventHandlerImplementation::Shutdown() {
-  SendData(kShutdownId, 0, 0);
+  Notify(kShutdownId, 0, 0);
 }
 
 
-void EventHandlerImplementation::SendData(intptr_t id,
-                                          Dart_Port dart_port,
-                                          intptr_t data) {
+void EventHandlerImplementation::Notify(intptr_t id,
+                                        Dart_Port dart_port,
+                                        intptr_t data) {
   WakeupHandler(id, dart_port, data);
 }