Cosmetics

Change-Id: I46c79068f9de3451483b63e8963143ab283cf53b

@@ -84,9 +84,7 @@ final class EncodableDiscreteResources implements DiscreteResources {
 
     @Override
     public DiscreteResources difference(DiscreteResources other) {
-        Set<DiscreteResource> diff = Sets.difference(values(), other.values());
-
-        return of(parent, diff);
+        return of(parent, Sets.difference(values(), other.values()));
     }
 
     @Override

@@ -58,7 +58,7 @@ final class GenericDiscreteResources implements DiscreteResources {
 
     @Override
     public DiscreteResources difference(DiscreteResources other) {
-        return new GenericDiscreteResources(Sets.difference(this.values, other.values()));
+        return of(Sets.difference(this.values(), other.values()));
     }
 
     @Override

@@ -65,7 +65,7 @@ final class UnifiedDiscreteResources implements DiscreteResources {
 
     @Override
     public DiscreteResources difference(DiscreteResources other) {
-        return of(Sets.difference(values(), other.values()));
+        return of(Sets.difference(this.values(), other.values()));
     }
 
     @Override