Move the dart_precompiled function inside scoping function.

tests/language/deferred_shared_and_unshared_classes_lib_shared.dart

Index: tests/language/deferred_shared_and_unshared_classes_lib_shared.dart
diff --git a/tools/canary.dart b/tests/language/deferred_shared_and_unshared_classes_lib_shared.dart
similarity index 66%
copy from tools/canary.dart
copy to tests/language/deferred_shared_and_unshared_classes_lib_shared.dart
index cca1f90cd7be8eb2481a00a89bbc7ba7edaa6d4f..52ddf46ebb46c7ff6454848e3a291e0b36ce2b43 100644
--- a/tools/canary.dart
+++ b/tests/language/deferred_shared_and_unshared_classes_lib_shared.dart
@@ -2,10 +2,14 @@
 // 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.
 
-// Script which exits with code 42.
-
-import 'dart:io';
+class CShared {
+  toString() => "shared";
+}
 
-void main() {
-  exitCode = 42;
+class C1 {
+  toString() => "C1";
 }
+
+class C2 {
+  toString() => "C2";
+}