Minor refactoring in QuicDispatcher. No functional change, not flag-protected.

net/tools/quic/quic_dispatcher.cc

Index: net/tools/quic/quic_dispatcher.cc
diff --git a/net/tools/quic/quic_dispatcher.cc b/net/tools/quic/quic_dispatcher.cc
index 486aea70a3eb36947b0af412b27756a54ab86fd7..c65929e6d57b8cc00e53a6102cdd5bb58fec00a8 100644
--- a/net/tools/quic/quic_dispatcher.cc
+++ b/net/tools/quic/quic_dispatcher.cc
@@ -325,12 +325,21 @@ bool QuicDispatcher::OnUnauthenticatedHeader(const QuicPacketHeader& header) {
     return false;
   }
 
-  // Packet's connection ID is unknown.
-  // Apply the validity checks.
+  // Packet's connection ID is unknown.  Apply the validity checks.
   QuicPacketFate fate = ValidityChecks(header);
   if (fate == kFateProcess) {
     fate = MaybeRejectStatelessly(connection_id, header);
   }
+
+  // Perform whatever actions are needed on the current packet.
+  ProcessUnauthenticatedHeaderFate(fate, connection_id, header.packet_number);
+  return false;
+}
+
+void QuicDispatcher::ProcessUnauthenticatedHeaderFate(
+    QuicPacketFate fate,
+    QuicConnectionId connection_id,
+    QuicPacketNumber packet_number) {
   switch (fate) {
     case kFateProcess: {
       ProcessChlo();
@@ -340,8 +349,7 @@ bool QuicDispatcher::OnUnauthenticatedHeader(const QuicPacketHeader& header) {
       // MaybeRejectStatelessly might have already added the connection to
       // time wait, in which case it should not be added again.
       if (!FLAGS_quic_use_cheap_stateless_rejects ||
-          !time_wait_list_manager_->IsConnectionIdInTimeWait(
-              header.public_header.connection_id)) {
+          !time_wait_list_manager_->IsConnectionIdInTimeWait(connection_id)) {
         // Add this connection_id to the time-wait state, to safely reject
         // future packets.
         DVLOG(1) << "Adding connection ID " << connection_id
@@ -350,12 +358,10 @@ bool QuicDispatcher::OnUnauthenticatedHeader(const QuicPacketHeader& header) {
             connection_id, framer_.version(),
             /*connection_rejected_statelessly=*/false, nullptr);
       }
-      DCHECK(time_wait_list_manager_->IsConnectionIdInTimeWait(
-          header.public_header.connection_id));
+      DCHECK(time_wait_list_manager_->IsConnectionIdInTimeWait(connection_id));
       time_wait_list_manager_->ProcessPacket(
-          current_server_address_, current_client_address_,
-          header.public_header.connection_id, header.packet_number,
-          *current_packet_);
+          current_server_address_, current_client_address_, connection_id,
+          packet_number, *current_packet_);
       break;
     case kFateBuffer:
       // This packet is a non-CHLO packet which has arrived out of order.
@@ -366,8 +372,6 @@ bool QuicDispatcher::OnUnauthenticatedHeader(const QuicPacketHeader& header) {
       // Do nothing with the packet.
       break;
   }
-
-  return false;
 }
 
 QuicDispatcher::QuicPacketFate QuicDispatcher::ValidityChecks(