Use proper pair type in range-based for map iterations.

net/quic/quic_stream_factory.cc

Index: net/quic/quic_stream_factory.cc
diff --git a/net/quic/quic_stream_factory.cc b/net/quic/quic_stream_factory.cc
index ec3eecd9709c7d94c635e7b3d44f5119ad14f450..2e5afd23ff8cfa463c08c883b04ca15b3148534a 100644
--- a/net/quic/quic_stream_factory.cc
+++ b/net/quic/quic_stream_factory.cc
@@ -1147,7 +1147,7 @@ void QuicStreamFactory::InitializeCachedStateInCryptoConfig(
 
   if (http_server_properties_) {
     if (quic_supported_servers_at_startup_.empty()) {
-      for (const std::pair<net::HostPortPair, net::AlternateProtocolInfo>&
+      for (const std::pair<const net::HostPortPair, net::AlternateProtocolInfo>&
                key_value : http_server_properties_->alternate_protocol_map()) {
         if (key_value.second.protocol == QUIC) {
           quic_supported_servers_at_startup_.insert(key_value.first);