Add QuicDataChannel and QuicDataTransport classes

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 1a7313c245705651bf3dbcf1244089f236811db8..ec8ac73fee69db988134d6b8580d5a1da09a94ca 100644
--- a/webrtc/p2p/quic/quicconnectionhelper_unittest.cc
+++ b/webrtc/p2p/quic/quicconnectionhelper_unittest.cc
@@ -52,10 +52,7 @@ 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; }