Fix a generics compile error on OSX java 1.6

Review at http://gwt-code-reviews.appspot.com/1289801

Review by: rchandia@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9550 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/user/test/com/google/gwt/requestfactory/client/RequestFactoryTestBase.java b/user/test/com/google/gwt/requestfactory/client/RequestFactoryTestBase.java
index 607e4a8..0ed2282 100644
--- a/user/test/com/google/gwt/requestfactory/client/RequestFactoryTestBase.java
+++ b/user/test/com/google/gwt/requestfactory/client/RequestFactoryTestBase.java
@@ -1,12 +1,12 @@
 /*
  * Copyright 2010 Google Inc.
- * 
+ *
  * Licensed under the Apache License, Version 2.0 (the "License"); you may not
  * use this file except in compliance with the License. You may obtain a copy of
  * the License at
- * 
+ *
  * http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
@@ -36,7 +36,7 @@
  * A base class for anything that makes use of the SimpleRequestFactory.
  * Subclasses must always use {@link #finishTestAndReset()} in order to allow
  * calls to the reset methods to complete before the next test starts.
- * 
+ *
  */
 public abstract class RequestFactoryTestBase extends GWTTestCase {
 
@@ -102,7 +102,7 @@
     store = new DefaultProxyStore(store.encode());
     s = req.getSerializer(store);
     T restored = s.deserialize(id.getProxyClass(), key);
-    AutoBean<BaseProxy> restoredBean = AutoBeanUtils.getAutoBean(restored);
+    AutoBean<? extends BaseProxy> restoredBean = AutoBeanUtils.getAutoBean(restored);
     assertNotSame(proxy, restored);
     /*
      * Performing a regular assertEquals() or even an AutoBeanUtils.diff() here