Downgrading rst stream codes which wouldn't be recognized by the peer.

net/quic/quic_protocol.cc

Index: net/quic/quic_protocol.cc
diff --git a/net/quic/quic_protocol.cc b/net/quic/quic_protocol.cc
index 5a59809ee4c14ac095e972b4a7bf1e4d4c16fe0d..f34db6d24e4fc9016a6dc6db8ec5dc037c87bdee 100644
--- a/net/quic/quic_protocol.cc
+++ b/net/quic/quic_protocol.cc
@@ -275,6 +275,21 @@ QuicCongestionFeedbackFrame::QuicCongestionFeedbackFrame() : type(kTCP) {}
 
 QuicCongestionFeedbackFrame::~QuicCongestionFeedbackFrame() {}
 
+QuicRstStreamErrorCode AdjustErrorForVersion(
+    QuicRstStreamErrorCode error_code,
+    QuicVersion version) {
+  switch (error_code) {
+    case QUIC_RST_FLOW_CONTROL_ACCOUNTING:
+      if (version <= QUIC_VERSION_17) {
+        return QUIC_STREAM_NO_ERROR;
+      }
+      break;
+    default:
+      return error_code;
+  }
+  return error_code;
+}
+
 QuicRstStreamFrame::QuicRstStreamFrame()
     : stream_id(0),
       error_code(QUIC_STREAM_NO_ERROR) {