Delete proxy and total samples, which have bit-rotted.

samples/total/client/IdGenerator.dart

Index: samples/total/client/IdGenerator.dart
===================================================================
--- samples/total/client/IdGenerator.dart	(revision 9011)
+++ samples/total/client/IdGenerator.dart	(working copy)
@@ -1,17 +0,0 @@
-// 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.
-
-/*
- * Object that returns an incrementing value that may be used as a unique id.
- */
-class IdGenerator {
-  int _id;
-
-  // Construct a IdGenerator that will start with a value of 0
-  IdGenerator() : _id = 0 {
-  }
-
-  // Return the next value in sequence
-  int next() => _id++;
-}