Add "deprecated" to the standard library.

pkg/meta/lib/meta.dart

Index: pkg/meta/lib/meta.dart
diff --git a/pkg/meta/lib/meta.dart b/pkg/meta/lib/meta.dart
index e3e4a250753c5b613716ce9f3c75b2298a663389..0c45644b1d62904fc42f2389300c4b113c298b58 100644
--- a/pkg/meta/lib/meta.dart
+++ b/pkg/meta/lib/meta.dart
@@ -5,7 +5,7 @@
 /**
  * Constants for use in metadata annotations such as
  * `@deprecated`, `@override`, and `@proxy`.
- * 
+ *
  * Annotations provide semantic information
  * that tools can use to provide a better user experience.
  * For example, an IDE might not autocomplete
@@ -21,17 +21,7 @@
  */
 library meta;
 
-/**
- * An annotation used to mark a class, field, getter, setter, method, top-level
- * variable, or top-level function as one that should no longer be used. Tools
- * can use this annotation to provide a warning on references to the marked
- * element.
- */
-const deprecated = const _Deprecated();
-
-class _Deprecated {
-  const _Deprecated();
-}
+export "dart:annotation" show deprecated;
 
 /**
  * An annotation used to mark an instance member (method, field, getter or
@@ -57,4 +47,4 @@ const proxy = const _Proxy();
 
 class _Proxy {
   const _Proxy();
-}
+}