Rename 'dart:debugger' to 'dart:developer'

runtime/lib/developer.dart

Index: runtime/lib/developer.dart
diff --git a/tests/compiler/dart2js_extra/deferred_fail_and_retry_lib.dart b/runtime/lib/developer.dart
similarity index 73%
copy from tests/compiler/dart2js_extra/deferred_fail_and_retry_lib.dart
copy to runtime/lib/developer.dart
index bf021a41818cb8a50e539b0689f4b8624792fd74..f62ef8b300dea3f382f019147ad66a952de17d4d 100644
--- a/tests/compiler/dart2js_extra/deferred_fail_and_retry_lib.dart
+++ b/runtime/lib/developer.dart
@@ -2,6 +2,4 @@
 // 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.
 
-foo() {
-  return "loaded";
-}
+patch bool debugger({bool when: true, String msg}) native "Developer_debugger";