Fix object-lifetime issues in async GetProof callpaths

net/quic/core/quic_crypto_stream.h

Index: net/quic/core/quic_crypto_stream.h
diff --git a/net/quic/core/quic_crypto_stream.h b/net/quic/core/quic_crypto_stream.h
index 494ecd7f1c5e7eee7a3a2748be4ffcc52ae8b538..5a154cf6696994501dd9ffc7ed2f50a2b44cf138 100644
--- a/net/quic/core/quic_crypto_stream.h
+++ b/net/quic/core/quic_crypto_stream.h
@@ -36,6 +36,8 @@ class NET_EXPORT_PRIVATE QuicCryptoStream
  public:
   explicit QuicCryptoStream(QuicSession* session);
 
+  ~QuicCryptoStream() override;
+
   // Returns the per-packet framing overhead associated with sending a
   // handshake message for |version|.
   static QuicByteCount CryptoMessageFramingOverhead(QuicVersion version);
@@ -79,7 +81,7 @@ class NET_EXPORT_PRIVATE QuicCryptoStream
   bool encryption_established_;
   bool handshake_confirmed_;
 
-  QuicCryptoNegotiatedParameters crypto_negotiated_params_;
+  scoped_refptr<QuicCryptoNegotiatedParameters> crypto_negotiated_params_;
 
  private:
   CryptoFramer crypto_framer_;