Update from https://crrev.com/311076

net/quic/quic_headers_stream.cc

Index: net/quic/quic_headers_stream.cc
diff --git a/net/quic/quic_headers_stream.cc b/net/quic/quic_headers_stream.cc
index e8c8b5866abbac8cc9a82726af62260539310733..676c82aff69f414a86925adfbf28bee42293256b 100644
--- a/net/quic/quic_headers_stream.cc
+++ b/net/quic/quic_headers_stream.cc
@@ -185,11 +185,6 @@ QuicHeadersStream::QuicHeadersStream(QuicSession* session)
       spdy_framer_visitor_(new SpdyFramerVisitor(this)) {
   spdy_framer_.set_visitor(spdy_framer_visitor_.get());
   spdy_framer_.set_debug_visitor(spdy_framer_visitor_.get());
-  if (version() < QUIC_VERSION_21) {
-    // Prior to QUIC_VERSION_21 the headers stream is not subject to any flow
-    // control.
-    DisableFlowControl();
-  }
   // The headers stream is exempt from connection level flow control.
   DisableConnectionFlowControlForThisStream();
 }