RefCounted types should not have public destructors, ipc/ edition

ipc/ipc_sync_message_filter.h

Index: ipc/ipc_sync_message_filter.h
diff --git a/ipc/ipc_sync_message_filter.h b/ipc/ipc_sync_message_filter.h
index 1f0f46d86c72c9f10421b7d2f9113b4a81d830be..7e4f56b0fec2b0dc4af625bc737bbca1d23f0a63 100644
--- a/ipc/ipc_sync_message_filter.h
+++ b/ipc/ipc_sync_message_filter.h
@@ -30,7 +30,6 @@ class IPC_EXPORT SyncMessageFilter : public ChannelProxy::MessageFilter,
                                      public Message::Sender {
  public:
   explicit SyncMessageFilter(base::WaitableEvent* shutdown_event);
-  virtual ~SyncMessageFilter();
 
   // Message::Sender implementation.
   virtual bool Send(Message* message) OVERRIDE;
@@ -41,6 +40,9 @@ class IPC_EXPORT SyncMessageFilter : public ChannelProxy::MessageFilter,
   virtual void OnChannelClosing() OVERRIDE;
   virtual bool OnMessageReceived(const Message& message) OVERRIDE;
 
+ protected:
+  virtual ~SyncMessageFilter();
+
  private:
   void SendOnIOThread(Message* message);
   // Signal all the pending sends as done, used in an error condition.