Revert of Refactoring that removes P2PTransport and DtlsTransport classes.

webrtc/p2p/base/p2ptransport.cc

Index: webrtc/p2p/base/p2ptransport.cc
diff --git a/webrtc/p2p/base/p2ptransport.cc b/webrtc/p2p/base/p2ptransport.cc
new file mode 100644
index 0000000000000000000000000000000000000000..1ad2a6faa3fa9486c06be5d5441f83bab957fdf3
--- /dev/null
+++ b/webrtc/p2p/base/p2ptransport.cc
@@ -0,0 +1,38 @@
+/*
+ *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/p2p/base/p2ptransport.h"
+
+#include <string>
+
+#include "webrtc/base/base64.h"
+#include "webrtc/base/common.h"
+#include "webrtc/base/stringencode.h"
+#include "webrtc/base/stringutils.h"
+#include "webrtc/p2p/base/p2ptransportchannel.h"
+
+namespace cricket {
+
+P2PTransport::P2PTransport(const std::string& name, PortAllocator* allocator)
+    : Transport(name, allocator) {}
+
+P2PTransport::~P2PTransport() {
+  DestroyAllChannels();
+}
+
+TransportChannelImpl* P2PTransport::CreateTransportChannel(int component) {
+  return new P2PTransportChannel(name(), component, port_allocator());
+}
+
+void P2PTransport::DestroyTransportChannel(TransportChannelImpl* channel) {
+  delete channel;
+}
+
+}  // namespace cricket