Revert of Refactoring that removes P2PTransport and DtlsTransport classes.

webrtc/p2p/quic/quictransport.h

Index: webrtc/p2p/quic/quictransport.h
diff --git a/webrtc/p2p/quic/quictransport.h b/webrtc/p2p/quic/quictransport.h
index 5e834e02f58e68e836df042b52de4331e8e88a79..14bd13f3b2befff5b941c1de25dc4df533cc775a 100644
--- a/webrtc/p2p/quic/quictransport.h
+++ b/webrtc/p2p/quic/quictransport.h
@@ -15,7 +15,7 @@
 #include <map>
 #include <memory>
 
-#include "webrtc/p2p/base/jseptransport.h"
+#include "webrtc/p2p/base/transport.h"
 #include "webrtc/p2p/quic/quictransportchannel.h"
 
 namespace cricket {
@@ -23,11 +23,7 @@
 class P2PTransportChannel;
 class PortAllocator;
 
-// TODO(deadbeef): To get QUIC working with TransportController again, would
-// need to merge this class with Transport (or make separate DTLS/QUIC
-// subclasses). The only difference between the two (as of typing this) is that
-// the QUIC channel *requires* a fingerprint, whereas the DTLS channel can
-// operate in a passthrough mode when SDES is used.
+// TODO(mikescarlett): Refactor to avoid code duplication with DtlsTransport.
 class QuicTransport : public Transport {
  public:
   QuicTransport(const std::string& name,