Remove base::SupportsWeakPtr from FrameReceiver

media/cast/receiver/frame_receiver.h

Index: media/cast/receiver/frame_receiver.h
diff --git a/media/cast/receiver/frame_receiver.h b/media/cast/receiver/frame_receiver.h
index dfda44fd4316c47128ac79948f34da52f3cfb5a9..7db6ef0a41777d33cfb1886c823005180736b8ac 100644
--- a/media/cast/receiver/frame_receiver.h
+++ b/media/cast/receiver/frame_receiver.h
@@ -50,8 +50,7 @@ class CastEnvironment;
 //
 // This class is not thread safe.  Should only be called from the Main cast
 // thread.
-class FrameReceiver : public RtpPayloadFeedback,
-                      public base::SupportsWeakPtr<FrameReceiver> {
+class FrameReceiver : public RtpPayloadFeedback {
  public:
   FrameReceiver(const scoped_refptr<CastEnvironment>& cast_environment,
                 const FrameReceiverConfig& config,
@@ -70,6 +69,8 @@ class FrameReceiver : public RtpPayloadFeedback,
   // out-of-order.  Returns true if the parsing of the packet succeeded.
   bool ProcessPacket(std::unique_ptr<Packet> packet);
 
+  base::WeakPtr<FrameReceiver> AsWeakPtr();
+
  protected:
   friend class FrameReceiverTest;  // Invokes ProcessParsedPacket().