Do not send PRIORITY_UPDATE from server.

While https://httpwg.org/http-extensions/draft-ietf-httpbis-priority.html allows
servers to send PRIORITY_UPDATE frames, there is currently no need for this
feature.  Note that clients are already ignoring incoming PRIORITY_UPDATE frames
in QuicSpdySession::OnPriorityUpdateForRequestStream().

gfe-relnote: n/a, change to QUIC v99-only code.  Protected by existing disabled gfe2_reloadable_flag_quic_enable_version_99.
PiperOrigin-RevId: 292373919
Change-Id: I3be6d6fef3c545746812d9b6c3543dc962273603

quic/core/http/quic_spdy_stream.cc

diff --git a/quic/core/http/quic_spdy_stream.cc b/quic/core/http/quic_spdy_stream.cc
index 29e0660..1e34bd7 100644
--- a/quic/core/http/quic_spdy_stream.cc
+++ b/quic/core/http/quic_spdy_stream.cc
@@ -1041,7 +1041,7 @@
         std::move(ack_listener));
   }
 
-  if (!priority_sent_) {
+  if (!priority_sent_ && session()->perspective() == Perspective::IS_CLIENT) {
     PriorityUpdateFrame priority_update;
     priority_update.prioritized_element_type = REQUEST_STREAM;
     priority_update.prioritized_element_id = id();

quic/core/http/quic_spdy_stream_test.cc

diff --git a/quic/core/http/quic_spdy_stream_test.cc b/quic/core/http/quic_spdy_stream_test.cc
index 8616ab7..1e9bbff 100644
--- a/quic/core/http/quic_spdy_stream_test.cc
+++ b/quic/core/http/quic_spdy_stream_test.cc
@@ -1297,11 +1297,6 @@
     // for headers and trailers.
     EXPECT_CALL(*session_, WritevData(stream_, stream_->id(), _, _, _))
         .Times(4);
-    // PRIORITY_UPDATE frame on the control stream.
-    auto send_control_stream =
-        QuicSpdySessionPeer::GetSendControlStream(session_.get());
-    EXPECT_CALL(*session_, WritevData(send_control_stream,
-                                      send_control_stream->id(), _, _, _));
   }
 
   // Write the initial headers, without a FIN.
@@ -1354,11 +1349,6 @@
     // HEADERS frame header and payload on the request stream.
     EXPECT_CALL(*session_, WritevData(stream_, stream_->id(), _, _, _))
         .Times(2);
-    // PRIORITY_UPDATE frame on the control stream.
-    auto send_control_stream =
-        QuicSpdySessionPeer::GetSendControlStream(session_.get());
-    EXPECT_CALL(*session_, WritevData(send_control_stream,
-                                      send_control_stream->id(), _, _, _));
   }
 
   // Write the initial headers.
@@ -1403,13 +1393,6 @@
   // also written on the stream in case of IETF QUIC.
   EXPECT_CALL(*session_, WritevData(stream_, stream_->id(), _, _, _))
       .Times(AtLeast(1));
-  if (UsesHttp3()) {
-    // PRIORITY_UPDATE frame.
-    auto send_control_stream =
-        QuicSpdySessionPeer::GetSendControlStream(session_.get());
-    EXPECT_CALL(*session_, WritevData(send_control_stream,
-                                      send_control_stream->id(), _, _, _));
-  }
 
   // Write the initial headers.
   EXPECT_CALL(*stream_, WriteHeadersMock(false));