Fix a Java8 test.

Change-Id: Ief7d35d03f3c91663674a28da890aa6f3d4fb377
diff --git a/user/test-super/com/google/gwt/dev/jjs/super/com/google/gwt/dev/jjs/test/Java8Test.java b/user/test-super/com/google/gwt/dev/jjs/super/com/google/gwt/dev/jjs/test/Java8Test.java
index 2dbad11..cfdb77f 100644
--- a/user/test-super/com/google/gwt/dev/jjs/super/com/google/gwt/dev/jjs/test/Java8Test.java
+++ b/user/test-super/com/google/gwt/dev/jjs/super/com/google/gwt/dev/jjs/test/Java8Test.java
@@ -507,7 +507,7 @@
     assertEquals("interface1.foo", c.foo());
   }
 
-  class AbstractClass implements InterfaceWithTwoDefenderMethods {
+  abstract class AbstractClass implements InterfaceWithTwoDefenderMethods {
   }
 
   class Child1 extends AbstractClass {