Remove base::SupportsWeakPtr and base::NonThreadSafe from PacedSender

media/cast/net/pacing/paced_sender.h

Index: media/cast/net/pacing/paced_sender.h
diff --git a/media/cast/net/pacing/paced_sender.h b/media/cast/net/pacing/paced_sender.h
index 7d601afaf626e8a715ff521673b0626c86b4df17..23b6c09998b8db1e221801b088bc583e473d6ab4 100644
--- a/media/cast/net/pacing/paced_sender.h
+++ b/media/cast/net/pacing/paced_sender.h
@@ -96,9 +96,7 @@ class PacedPacketSender {
   virtual ~PacedPacketSender() {}
 };
 
-class PacedSender : public PacedPacketSender,
-                    public base::NonThreadSafe,
-                    public base::SupportsWeakPtr<PacedSender> {
+class PacedSender : public PacedPacketSender {
  public:
   // |recent_packet_events| is an externally-owned vector where PacedSender will
   // add PacketEvents related to sending, retransmission, and rejection.  The