Revert "Switch libraries to using new tags."

sdk/lib/core/invocation_mirror.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.
 
-part of dart.core;
-
 /**
  * Representation of the invocation of a member on an object.
  *
  * This is the type of objects passed to [Object.noSuchMethod] when
  * an object doesn't support the member invocation that was attempted
  * on it.
  */
 abstract class InvocationMirror {
   /** The name of the invoked member. */
   String get memberName;
@@ skipping 26 matching lines @@
 
   /**
    * Perform the invocation on the provided object.
    *
    * If the object doesn't support the invocation, its [noSuchMethod]
    * method will be called with either this [InvocationMirror] or another
    * equivalent [InvocationMirror].
    */
   invokeOn(Object receiver);
 }