Revert "Wrote functions to convert collections and maps to strings and invoked"

corelib/src/implementation/splay_tree.dart

Index: corelib/src/implementation/splay_tree.dart
diff --git a/corelib/src/implementation/splay_tree.dart b/corelib/src/implementation/splay_tree.dart
index 43c020e0c1b160d7a394d9afa1f450b9d3d693dd..43195165d06213aacd0d0f72fbfb802783e12d6b 100644
--- a/corelib/src/implementation/splay_tree.dart
+++ b/corelib/src/implementation/splay_tree.dart
@@ -1,4 +1,4 @@
-// Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+// Copyright (c) 2011, 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.
 
@@ -234,8 +234,4 @@ class SplayTree<K extends Comparable, V> implements Map<K, V> {
     forEach((K k, V v) { list.add(v); });
     return list;
   }
-
-  String toString() {
-    return Maps.mapToString(this);
-  }
 }