FilterDirectRepresentation always should be considered as has modification.

Therefore isNil should be false.

bug:9468909
Change-Id: I9946d060e7a1c73b6dc27c73d8f3b7986343de98
diff --git a/src/com/android/gallery3d/filtershow/filters/FilterDirectRepresentation.java b/src/com/android/gallery3d/filtershow/filters/FilterDirectRepresentation.java
index 3807ee1..9c986a6 100644
--- a/src/com/android/gallery3d/filtershow/filters/FilterDirectRepresentation.java
+++ b/src/com/android/gallery3d/filtershow/filters/FilterDirectRepresentation.java
@@ -22,8 +22,4 @@
         super(name);
     }
 
-    public boolean isNil() {
-        return true;
-    }
-
 }