Update from chromium https://crrev.com/302282

net/quic/quic_framer.cc

Index: net/quic/quic_framer.cc
diff --git a/net/quic/quic_framer.cc b/net/quic/quic_framer.cc
index 7e914f878c03c69e3d9000ca619970607947b5db..e2487b4bd07a5fe1cbdde60e322ddcb0c1c1bfae 100644
--- a/net/quic/quic_framer.cc
+++ b/net/quic/quic_framer.cc
@@ -883,7 +883,8 @@ bool QuicFramer::ProcessPublicHeader(
         set_detailed_error("Unable to read ConnectionId.");
         return false;
       }
-      if ((public_header->connection_id & k4ByteConnectionIdMask) !=
+      if (last_serialized_connection_id_ &&
+          (public_header->connection_id & k4ByteConnectionIdMask) !=
           (last_serialized_connection_id_ & k4ByteConnectionIdMask)) {
         set_detailed_error("Truncated 4 byte ConnectionId does not match "
                            "previous connection_id.");
@@ -898,7 +899,8 @@ bool QuicFramer::ProcessPublicHeader(
         set_detailed_error("Unable to read ConnectionId.");
         return false;
       }
-      if ((public_header->connection_id & k1ByteConnectionIdMask) !=
+      if (last_serialized_connection_id_ &&
+          (public_header->connection_id & k1ByteConnectionIdMask) !=
           (last_serialized_connection_id_ & k1ByteConnectionIdMask)) {
         set_detailed_error("Truncated 1 byte ConnectionId does not match "
                            "previous connection_id.");