QUIC_VERSION_21: headers and crypto streams are now flow controlled at

net/quic/quic_crypto_stream.cc

Index: net/quic/quic_crypto_stream.cc
diff --git a/net/quic/quic_crypto_stream.cc b/net/quic/quic_crypto_stream.cc
index 0e447127af5cc3b5746bfdf15c3d70a36f623470..870a3cf7eaa86a1fb2d8de23da6967a3d46698e4 100644
--- a/net/quic/quic_crypto_stream.cc
+++ b/net/quic/quic_crypto_stream.cc
@@ -22,7 +22,13 @@ QuicCryptoStream::QuicCryptoStream(QuicSession* session)
       encryption_established_(false),
       handshake_confirmed_(false) {
   crypto_framer_.set_visitor(this);
-  DisableFlowControl();
+  if (version() <= QUIC_VERSION_20) {
+    // Prior to QUIC_VERSION_21 the crypto stream is not subject to any flow
+    // control.
+    DisableFlowControl();
+  }
+  // The crypto stream is exempt from connection level flow control.
+  DisableConnectionFlowControlForThisStream();
 }
 
 void QuicCryptoStream::OnError(CryptoFramer* framer) {