Remove tests.api.java.io.FileTest#test_delete as known failure.

BUG 2133089
diff --git a/libcore/luni/src/test/java/tests/api/java/io/FileTest.java b/libcore/luni/src/test/java/tests/api/java/io/FileTest.java
index bde5766..b10ab53 100644
--- a/libcore/luni/src/test/java/tests/api/java/io/FileTest.java
+++ b/libcore/luni/src/test/java/tests/api/java/io/FileTest.java
@@ -692,7 +692,6 @@
         method = "delete",
         args = {}
     )
-    @KnownFailure("Non empty directories are deleted on Android.")
     public void test_delete() {
         // Test for method boolean java.io.File.delete()
         try {