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

samples/total/client/SpreadsheetListener.dart

Index: samples/total/client/SpreadsheetListener.dart
===================================================================
--- samples/total/client/SpreadsheetListener.dart	(revision 9011)
+++ samples/total/client/SpreadsheetListener.dart	(working copy)
@@ -1,26 +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.
-
-/**
- * Listener for Spreadsheet events.  All [Spreadsheet] -> [SpreadsheetPresenter] calls should pass
- * through this interface.
- */
-interface SpreadsheetListener {
-
-  void onColumnInserted(int col);
-
-  void onColumnWidthChanged(int col, int size);
-
-  // Model requests a full refresh
-  // TODO: this is temporary (legacy) and needs to be broken into methods such
-  // as onCellChanged(), onCellsChanged(), etc.
-  void onRefresh();
-
-  void onRowHeightChanged(int row, int size);
-
-  void onRowInserted(int row);
-
-  // Table size (ie, number of columns or rows) changed
-  void onTableSizeChanged();
-}