Remove duplicated handshake_timeout_ clean-up in QuicIdleNetworkDetector.

PiperOrigin-RevId: 876364558

quiche/quic/core/quic_idle_network_detector.cc

diff --git a/quiche/quic/core/quic_idle_network_detector.cc b/quiche/quic/core/quic_idle_network_detector.cc
index 1d5db46..27f3a50 100644
--- a/quiche/quic/core/quic_idle_network_detector.cc
+++ b/quiche/quic/core/quic_idle_network_detector.cc
@@ -58,7 +58,6 @@
   alarm_.PermanentCancel();
   handshake_timeout_ = QuicTime::Delta::Infinite();
   idle_network_timeout_ = QuicTime::Delta::Infinite();
-  handshake_timeout_ = QuicTime::Delta::Infinite();
   stopped_ = true;
 }