Remove unused return value for QuicSession::OnStopSendingFrame().

gfe-relnote: protected by disabled v99 flag.
PiperOrigin-RevId: 277115916
Change-Id: I15b4a9ce1b5316d723e097f6aa8d590b2955e4e0
diff --git a/quic/core/quic_connection.h b/quic/core/quic_connection.h
index bc97119..f618ddf 100644
--- a/quic/core/quic_connection.h
+++ b/quic/core/quic_connection.h
@@ -165,7 +165,7 @@
   virtual void OnForwardProgressConfirmed() = 0;
 
   // Called when a STOP_SENDING frame has been received.
-  virtual bool OnStopSendingFrame(const QuicStopSendingFrame& frame) = 0;
+  virtual void OnStopSendingFrame(const QuicStopSendingFrame& frame) = 0;
 };
 
 // Interface which gets callbacks from the QuicConnection at interesting