Remove suppression of fixed test.

Test: vogar org.apache.harmony.security.tests.java.security.Signature2Test
Test: cts -m CtsLibcoreTestCases -t org.apache...Signature2Test
Change-Id: I9cac0198a783fb3f2c630390102127a75c6f33a1
diff --git a/tools/libcore_failures.txt b/tools/libcore_failures.txt
index 08abdb3..65296406 100644
--- a/tools/libcore_failures.txt
+++ b/tools/libcore_failures.txt
@@ -105,12 +105,6 @@
   names: ["org.apache.harmony.tests.java.lang.ProcessTest#test_getErrorStream"]
 },
 {
-  description: "Error decoding digital signature bytes.",
-  result: EXEC_FAILED,
-  name: "org.apache.harmony.security.tests.java.security.Signature2Test#test_verify$BII",
-  bug: 18869265
-},
-{
   description: "Test sometimes timeouts on volantis, and on most modes in debug mode",
   result: EXEC_TIMEOUT,
   names: ["libcore.java.lang.SystemTest#testArrayCopyConcurrentModification"],