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

samples/total/client/PopupHandler.dart

-// 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.
-
-class PopupHandler {
-  // references to CSS classes for fade in and fade out transitions
-  static final String _fadeInClass = "fadeIn";
-  static final String _fadeOutClass = "fadeOut";
-  static PopupHandler _instance; // singleton
-
-  Element _activePopup;
-
-  factory PopupHandler(Document doc) {
-    if (_instance == null) {
-      _instance = new PopupHandler._internal(doc);
-    }
-    return _instance;
-  }
-
-  PopupHandler._internal(Document doc) {
-    Element body = doc.body;
-
-    body.on.click.add((Event e) {
-      if (_activePopup == null) {
-        return;
-      }
-      Element target = e.target;
-      while (target != null && target != body && target != _activePopup) {
-        target = target.parent;
-      }
-      if (target != _activePopup) {
-        deactivatePopup();
-      }
-    }, true);
-  }
-
-  void activatePopup(Element popup, int x, int y) {
-    if (_activePopup != null) {
-      deactivatePopup();
-    }
-
-    _activePopup = popup;
-    _activePopup.style.setProperty("left", HtmlUtils.toPx(x));
-    _activePopup.style.setProperty("top", HtmlUtils.toPx(y));
-
-    Set<String> classes = _activePopup.classes;
-    classes.remove(_fadeOutClass);
-    classes.add(_fadeInClass);
-  }
-
-  void deactivatePopup() {
-    if (_activePopup == null) {
-      return;
-    }
-    Set<String> classes = _activePopup.classes;
-    classes.remove(_fadeInClass);
-    classes.add(_fadeOutClass);
-    _activePopup = null;
-  }
-}