Update default HTTP/3 priority.

Default value in draft spec was changed from 1 to 3 at
https://github.com/httpwg/http-extensions/pull/1172.

Protected by FLAGS_quic_reloadable_flag_quic_http3_new_default_urgency_value.

PiperOrigin-RevId: 329295352
Change-Id: I7a3a42ed25f3250b8aa465c5c34ca924ba3167bc
diff --git a/quic/core/http/quic_spdy_session_test.cc b/quic/core/http/quic_spdy_session_test.cc
index 0ff48c1..fa6aec9 100644
--- a/quic/core/http/quic_spdy_session_test.cc
+++ b/quic/core/http/quic_spdy_session_test.cc
@@ -2143,7 +2143,7 @@
 
   // PRIORITY_UPDATE frame arrives after stream creation.
   TestStream* stream1 = session_.CreateIncomingStream(stream_id1);
-  EXPECT_EQ(QuicStream::kDefaultUrgency,
+  EXPECT_EQ(QuicStream::DefaultUrgency(),
             stream1->precedence().spdy3_priority());
   EXPECT_CALL(debug_visitor, OnPriorityUpdateFrameReceived(priority_update1));
   session_.OnStreamFrame(data3);
diff --git a/quic/core/http/quic_spdy_stream.cc b/quic/core/http/quic_spdy_stream.cc
index 259493f..a14c3e5 100644
--- a/quic/core/http/quic_spdy_stream.cc
+++ b/quic/core/http/quic_spdy_stream.cc
@@ -199,7 +199,7 @@
       sequencer_offset_(0),
       is_decoder_processing_input_(false),
       ack_listener_(nullptr),
-      last_sent_urgency_(kDefaultUrgency) {
+      last_sent_urgency_(DefaultUrgency()) {
   DCHECK_EQ(session()->connection(), spdy_session->connection());
   DCHECK_EQ(transport_version(), spdy_session->transport_version());
   DCHECK(!QuicUtils::IsCryptoStreamId(transport_version(), id));
@@ -235,7 +235,7 @@
       sequencer_offset_(sequencer()->NumBytesConsumed()),
       is_decoder_processing_input_(false),
       ack_listener_(nullptr),
-      last_sent_urgency_(kDefaultUrgency) {
+      last_sent_urgency_(DefaultUrgency()) {
   DCHECK_EQ(session()->connection(), spdy_session->connection());
   DCHECK_EQ(transport_version(), spdy_session->transport_version());
   DCHECK(!QuicUtils::IsCryptoStreamId(transport_version(), id()));