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

corelib/src/implementation/linked_hash_map.dart

Index: corelib/src/implementation/linked_hash_map.dart
diff --git a/corelib/src/implementation/linked_hash_map.dart b/corelib/src/implementation/linked_hash_map.dart
index daa2062d20c4bb2d7441b71233d86b1ed878f5bc..8c1ebf54b0c377e22683fba6cb9626aa5302f9e7 100644
--- a/corelib/src/implementation/linked_hash_map.dart
+++ b/corelib/src/implementation/linked_hash_map.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.
 
@@ -114,8 +114,4 @@ class LinkedHashMapImplementation<K extends Hashable, V>
     _map.clear();
     _list.clear();
   }
-
-  String toString() {
-    return Maps.mapToString(this);
-  }
 }