Change the error handling in dart:io

runtime/bin/socket.dart

Index: runtime/bin/socket.dart
diff --git a/runtime/bin/socket.dart b/runtime/bin/socket.dart
index e8b53bd9664d9bbbb261e14c35848a341cae0a91..6c1b49de72023eb589f700e411cf0b33e570d452 100644
--- a/runtime/bin/socket.dart
+++ b/runtime/bin/socket.dart
@@ -18,7 +18,7 @@ interface ServerSocket default _ServerSocket {
   /**
    * The error handler gets called when a socket error occurs.
    */
-  void set onError(void callback(Exception e));
+  void set onError(void callback(e));
 
   /**
    * Returns the port used by this socket.
@@ -89,7 +89,7 @@ interface Socket extends Hashable default _Socket {
   /**
    * The error handler gets called when a socket error occurs.
    */
-  void set onError(void callback(Exception e));
+  void set onError(void callback(e));
 
   /**
    * Returns input stream to the socket.