Revert of Modified PeerConnection and WebRtcSession for end-to-end QuicDataChannel usage.

webrtc/p2p/base/faketransportcontroller.h

Index: webrtc/p2p/base/faketransportcontroller.h
diff --git a/webrtc/p2p/base/faketransportcontroller.h b/webrtc/p2p/base/faketransportcontroller.h
index c15e164f41eed0f5915c849383d7dce2374e8ea4..b8c67ecd17aacaab29e459ed264ed6afb3508b54 100644
--- a/webrtc/p2p/base/faketransportcontroller.h
+++ b/webrtc/p2p/base/faketransportcontroller.h
@@ -28,10 +28,6 @@
 #include "webrtc/base/sigslot.h"
 #include "webrtc/base/sslfingerprint.h"
 #include "webrtc/base/thread.h"
-
-#ifdef HAVE_QUIC
-#include "webrtc/p2p/quic/quictransport.h"
-#endif
 
 namespace cricket {
 
@@ -457,21 +453,6 @@
   rtc::SSLProtocolVersion ssl_max_version_ = rtc::SSL_PROTOCOL_DTLS_12;
 };
 
-#ifdef HAVE_QUIC
-class FakeQuicTransport : public QuicTransport {
- public:
-  FakeQuicTransport(const std::string& transport_name)
-      : QuicTransport(transport_name, nullptr, nullptr) {}
-
- protected:
-  QuicTransportChannel* CreateTransportChannel(int component) override {
-    FakeTransportChannel* fake_ice_transport_channel =
-        new FakeTransportChannel(name(), component);
-    return new QuicTransportChannel(fake_ice_transport_channel);
-  }
-};
-#endif
-
 // Fake candidate pair class, which can be passed to BaseChannel for testing
 // purposes.
 class FakeCandidatePair : public CandidatePairInterface {
@@ -560,11 +541,6 @@
 
  protected:
   Transport* CreateTransport_n(const std::string& transport_name) override {
-#ifdef HAVE_QUIC
-    if (quic()) {
-      return new FakeQuicTransport(transport_name);
-    }
-#endif
     return new FakeTransport(transport_name);
   }