Fix Test Blacklist Mistake for HC MR2

Bad merge blacklisted the Browser security test for HC MR2.

Change-Id: If9fc56cda62315a6b6eed75764da4ae4c0a9a404
diff --git a/tests/expectations/knownfailures.txt b/tests/expectations/knownfailures.txt
index bfa478b..cb225ae 100644
--- a/tests/expectations/knownfailures.txt
+++ b/tests/expectations/knownfailures.txt
@@ -21,10 +21,6 @@
   bug: 4464677
 },
 {
-  name: "android.security.cts.BrowserTest",
-  description: "Fixed in HC MR2"
-},
-{
   name: "android.telephony.cts.PhoneNumberFormattingTextWatcherTest#testPhoneNumberFormattingTextWatcher",
   bug: 3198578
 },