RefCounted types should not have public destructors, ipc/ edition

BUG=123295
TEST=none


Review URL: http://codereview.chromium.org/10008108

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@134421 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: f729d15a933e28cfc000953b75535acc90c3aa5e
diff --git a/ipc/ipc_sync_channel_unittest.cc b/ipc/ipc_sync_channel_unittest.cc
index 0424b2f..7f0a7ab 100644
--- a/ipc/ipc_sync_channel_unittest.cc
+++ b/ipc/ipc_sync_channel_unittest.cc
@@ -1110,6 +1110,9 @@
     worker_->Done();
   }
 
+ private:
+  virtual ~TestSyncMessageFilter() {}
+
   Worker* worker_;
   base::Thread thread_;
 };