Split dart:builtin into dart:builtin and dart:io.

runtime/bin/stdio.dart

Index: runtime/bin/stdio.dart
diff --git a/runtime/bin/builtin.dart b/runtime/bin/stdio.dart
similarity index 62%
copy from runtime/bin/builtin.dart
copy to runtime/bin/stdio.dart
index 3e8d5d55ee6e7a50eb53439de4354b32f4c5dbee..4f154fbe6d36e39da00a75e65a51fbd7205315da 100644
--- a/runtime/bin/builtin.dart
+++ b/runtime/bin/stdio.dart
@@ -1,22 +1,7 @@
-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
-#library("builtin");
-#import("dart:nativewrappers");
-#import("dart:coreimpl");
-
-void print(arg) {
-  _Logger._printString(arg.toString());
-}
-
-void exit(int status) {
-  if (status is !int) {
-    throw new IllegalArgumentException("int status expected");
-  }
-  _exit(status);
-}
-
 Socket _stdin;
 InputStream get stdin() {
   if (_stdin == null) {
@@ -44,10 +29,4 @@ OutputStream get stderr() {
   return _stderr.outputStream;
 }
 
-_exit(int status) native "Exit";
-
 _getStdioHandle(Socket socket, int num) native "Socket_GetStdioHandle";
-
-class _Logger {
-  static void _printString(String s) native "Logger_PrintString";
-}