Cleanup the getting and setting of the socket file descriptor

runtime/bin/eventhandler.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "bin/dartutils.h"
 #include "bin/eventhandler.h"
 #include "bin/socket.h"
 #include "bin/thread.h"
 
 #include "include/dart_api.h"
@@ skipping 72 matching lines @@
 /*
  * Send data to the EventHandler thread to register for a given instance
  * args[0] a ReceivePort args[1] with a notification event args[2].
  */
 void FUNCTION_NAME(EventHandler_SendData)(Dart_NativeArguments args) {
   Dart_Handle sender = Dart_GetNativeArgument(args, 0);
   intptr_t id = kInvalidId;
   if (Dart_IsNull(sender)) {
     id = kTimerId;
   } else {
-    Socket::GetSocketIdNativeField(sender, &id);
+    id = Socket::GetSocketIdNativeField(sender);
   }
   Dart_Handle handle = Dart_GetNativeArgument(args, 1);
   Dart_Port dart_port =
       DartUtils::GetIntegerField(handle, DartUtils::kIdFieldName);
   int64_t data = DartUtils::GetIntegerValue(Dart_GetNativeArgument(args, 2));
   if (id == kTimerId && data == 0) {
     // This is a 0-timer. Simply queue a 'null' on the port.
     DartUtils::PostNull(dart_port);
   } else {
     event_handler->SendData(id, dart_port, data);
   }
 }
 
 }  // namespace bin
 }  // namespace dart