Revert "Switch libraries to using new tags."

sdk/lib/core/core.dart

 // Copyright (c) 2012, 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.
 
-library dart.core;
+#library("dart:core");
 
-import "dart:collection";
+#import("dart:collection");
 
-part "bool.dart";
-part "collection.dart";
-part "comparable.dart";
-part "date.dart";
-part "double.dart";
-part "duration.dart";
-part "errors.dart";
-part "exceptions.dart";
-part "expando.dart";
-part "expect.dart";
-part "function.dart";
-part "future.dart";
-part "future_impl.dart";
-part "hashable.dart";
-part "identical.dart";
-part "int.dart";
-part "invocation_mirror.dart";
-part "iterable.dart";
-part "iterator.dart";
-part "list.dart";
-part "map.dart";
-part "num.dart";
-part "object.dart";
-part "options.dart";
-part "pattern.dart";
-part "print.dart";
-part "queue.dart";
-part "regexp.dart";
-part "sequences.dart";
-part "set.dart";
-part "sort.dart";
-part "stopwatch.dart";
-part "string.dart";
-part "string_buffer.dart";
-part "strings.dart";
-part "type.dart";
+#source("bool.dart");
+#source("collection.dart");
+#source("comparable.dart");
+#source("date.dart");
+#source("double.dart");
+#source("duration.dart");
+#source("errors.dart");
+#source("exceptions.dart");
+#source("expando.dart");
+#source("expect.dart");
+#source("function.dart");
+#source("future.dart");
+#source("future_impl.dart");
+#source("hashable.dart");
+#source("identical.dart");
+#source("int.dart");
+#source("invocation_mirror.dart");
+#source("iterable.dart");
+#source("iterator.dart");
+#source("list.dart");
+#source("map.dart");
+#source("num.dart");
+#source("object.dart");
+#source("options.dart");
+#source("pattern.dart");
+#source("print.dart");
+#source("queue.dart");
+#source("regexp.dart");
+#source("sequences.dart");
+#source("set.dart");
+#source("sort.dart");
+#source("stopwatch.dart");
+#source("string.dart");
+#source("string_buffer.dart");
+#source("strings.dart");
+#source("type.dart");