Revert "Change `msg` to `message` in debugger function."

runtime/lib/developer.dart

 // Copyright (c) 2015, 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.
 
-patch bool debugger({bool when: true,
-                     String message}) native "Developer_debugger";
+patch bool debugger({bool when: true, String msg}) native "Developer_debugger";
 
-patch Object inspect(Object object) native "Developer_inspect";
+patch inspect(object) native "Developer_inspect";
 
 patch log({int sequenceNumber,
            int millisecondsSinceEpoch,
            int level,
            String name,
            String message,
            Zone zone,
            Object error,
-           StackTrace stackTrace}) native "Developer_log";
+           StackTrace stackTrace}) native "Developer_log";