Update QuicTransportChannel to latest version of libquic (Chromium: f03d2c62)

webrtc/p2p/quic/quicconnectionhelper_unittest.cc

Index: webrtc/p2p/quic/quicconnectionhelper_unittest.cc
diff --git a/webrtc/p2p/quic/quicconnectionhelper_unittest.cc b/webrtc/p2p/quic/quicconnectionhelper_unittest.cc
index b56ae8c4b73e9259e97a00b7a96bb47c06eaf2dc..5f16b52c62e3e6843b7b1c91db3173899c34a622 100644
--- a/webrtc/p2p/quic/quicconnectionhelper_unittest.cc
+++ b/webrtc/p2p/quic/quicconnectionhelper_unittest.cc
@@ -53,10 +53,7 @@ class MockAlarmDelegate : public QuicAlarm::Delegate {
  public:
   MockAlarmDelegate() : fired_(false) {}
 
-  QuicTime OnAlarm() override {
-    fired_ = true;
-    return QuicTime::Zero();
-  }
+  void OnAlarm() override { fired_ = true; }
 
   bool fired() const { return fired_; }
   void Clear() { fired_ = false; }