bumping the delayTestFinish timeout in ImageResourceTest.testDedup.  Maybe my XP machine was overloaded, but I'm bumping the half-second limit on local tests.

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@5528 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/user/test/com/google/gwt/resources/client/ImageResourceTest.java b/user/test/com/google/gwt/resources/client/ImageResourceTest.java
index cf8aa4c..f16ba77 100644
--- a/user/test/com/google/gwt/resources/client/ImageResourceTest.java
+++ b/user/test/com/google/gwt/resources/client/ImageResourceTest.java
@@ -103,7 +103,7 @@
     });
 
     RootPanel.get().add(i);
-    delayTestFinish(500);
+    delayTestFinish(1000);
   }
 
   public void testPacking() {