Remove unused QuicErrorCode QUIC_PACKET_FOR_NONEXISTENT_STREAM. No behavior change.

net/quic/quic_protocol.h

Index: net/quic/quic_protocol.h
diff --git a/net/quic/quic_protocol.h b/net/quic/quic_protocol.h
index d8edc45e9d43020a9e78472b401c734c1ec107f4..0c04ce7968edb9b7af953e74fe584db2a658dd7c 100644
--- a/net/quic/quic_protocol.h
+++ b/net/quic/quic_protocol.h
@@ -494,8 +494,6 @@ enum QuicErrorCode {
   // ACK frame data is malformed.
   QUIC_INVALID_ACK_DATA = 9,
 
-  // deprecated: QUIC_INVALID_CONGESTION_FEEDBACK_DATA = 47,
-
   // Version negotiation packet is malformed.
   QUIC_INVALID_VERSION_NEGOTIATION_PACKET = 10,
   // Public RST packet is malformed.
@@ -506,8 +504,6 @@ enum QuicErrorCode {
   QUIC_ENCRYPTION_FAILURE = 13,
   // The packet exceeded kMaxPacketSize.
   QUIC_PACKET_TOO_LARGE = 14,
-  // Data was sent for a stream which did not exist.
-  QUIC_PACKET_FOR_NONEXISTENT_STREAM = 15,
   // The peer is going away.  May be a client or server.
   QUIC_PEER_GOING_AWAY = 16,
   // A stream ID was invalid.
@@ -525,8 +521,6 @@ enum QuicErrorCode {
   // Invalid protocol version.
   QUIC_INVALID_VERSION = 20,
 
-  // deprecated: QUIC_STREAM_RST_BEFORE_HEADERS_DECOMPRESSED = 21
-
   // The Header ID for a stream was too far from the previous.
   QUIC_INVALID_HEADER_ID = 22,
   // Negotiable parameter received during handshake had invalid value.