Clean up observable tests to new API.

client/tests/client/observable/ObservableTestSetBase.dart

Index: client/tests/client/observable/ObservableTestSetBase.dart
diff --git a/client/tests/client/observable/ObservableTestSetBase.dart b/client/tests/client/observable/ObservableTestSetBase.dart
deleted file mode 100644
index a5c1b20fd17c1b583041bbff171923f8cebc4e52..0000000000000000000000000000000000000000
--- a/client/tests/client/observable/ObservableTestSetBase.dart
+++ /dev/null
@@ -1,21 +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.
-
-/**
- * Defines helper methods that the other TestSet classes in this library
- * share.
- */
-class ObservableTestSetBase extends TestSet {
-  // TODO(rnystrom): Remove this when default constructors are supported.
-  ObservableTestSetBase() : super();
-
-  void checkEvent(ChangeEvent e, target, pName, index, type, newVal, oldVal) {
-    expect(e.target).equals(target);
-    expect(e.propertyName).equals(pName);
-    expect(e.index).equals(index);
-    expect(e.type).equals(type);
-    expect(e.newValue).equals(newVal);
-    expect(e.oldValue).equals(oldVal);
-  }
-}