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

runtime/lib/developer.dart

Index: runtime/lib/developer.dart
diff --git a/runtime/lib/developer.dart b/runtime/lib/developer.dart
index 529c53ac0803db3ada0016ba428b73e5f96ed028..242ef04603056d75b3e790633d60029161555881 100644
--- a/runtime/lib/developer.dart
+++ b/runtime/lib/developer.dart
@@ -2,10 +2,9 @@
 // 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,
@@ -14,4 +13,4 @@ patch log({int sequenceNumber,
            String message,
            Zone zone,
            Object error,
-           StackTrace stackTrace}) native "Developer_log";
+           StackTrace stackTrace}) native "Developer_log";