Removes a Java 1.6-ism.

Review at http://gwt-code-reviews.appspot.com/1304801

Review by: knorton@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@9563 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/user/test/com/google/gwt/dev/jjs/test/singlejso/TypeHierarchyTest.java b/user/test/com/google/gwt/dev/jjs/test/singlejso/TypeHierarchyTest.java
index 03d38ac..bd62651 100644
--- a/user/test/com/google/gwt/dev/jjs/test/singlejso/TypeHierarchyTest.java
+++ b/user/test/com/google/gwt/dev/jjs/test/singlejso/TypeHierarchyTest.java
@@ -127,7 +127,6 @@
   }
 
   private static class JvmNode implements Node {
-    @Override
     public JvmNode appendChild(Node node) {
       return (JvmNode)node;
     }
@@ -149,7 +148,6 @@
   }
 
   private static class JsNode extends JavaScriptObject implements Node {
-    @Override
     public final native JsNode appendChild(Node node) /*-{
       return node;
     }-*/;