Remove many things that depend on frog.

samples/pond/pond.dart

Index: samples/pond/pond.dart
===================================================================
--- samples/pond/pond.dart	(revision 6866)
+++ samples/pond/pond.dart	(working copy)
@@ -1,14 +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.
-
-#import("dart:html");
-#import("editors_stub.dart");
-#import("ui.dart");
-
-void main() {
-  PondUI ui = new PondUI();
-  window.on.contentLoaded.add((e) {
-    ui.setupAndRun(new EditorFactoryStub());
-  });
-}