gfe-relnote: Use encryption level instead of looking for the string "CHLO" to identify the QUIC ClientHello.  Client side change only, not flag protected.

PiperOrigin-RevId: 241995962
Change-Id: I840eb7531ef55f32c7bb06bc08bcdb947459e732
diff --git a/quic/core/quic_dispatcher.cc b/quic/core/quic_dispatcher.cc
index d1200a9..27ff2b8 100644
--- a/quic/core/quic_dispatcher.cc
+++ b/quic/core/quic_dispatcher.cc
@@ -163,7 +163,7 @@
       if (!QuicVersionUsesCryptoFrames(framer_->transport_version())) {
         if (!creator_.ConsumeData(
                 QuicUtils::GetCryptoStreamId(framer_->transport_version()),
-                reject.length(), offset, offset,
+                reject.length() - offset, offset,
                 /*fin=*/false,
                 /*needs_full_padding=*/true, NOT_RETRANSMISSION, &frame)) {
           QUIC_BUG << "Unable to consume data into an empty packet.";