Revert of make the DtlsTransportWrapper inherit form DtlsTransportInternal

webrtc/pc/channelmanager.h

Index: webrtc/pc/channelmanager.h
diff --git a/webrtc/pc/channelmanager.h b/webrtc/pc/channelmanager.h
index 879ea4d39b8194e27166b4379fbf20b87c8c68cd..2ee72270803e6d9bdfd9eeaf626e837632f0435a 100644
--- a/webrtc/pc/channelmanager.h
+++ b/webrtc/pc/channelmanager.h
@@ -90,8 +90,8 @@
   // Creates a voice channel, to be associated with the specified session.
   VoiceChannel* CreateVoiceChannel(
       webrtc::MediaControllerInterface* media_controller,
-      DtlsTransportInternal* rtp_transport,
-      DtlsTransportInternal* rtcp_transport,
+      TransportChannel* rtp_transport,
+      TransportChannel* rtcp_transport,
       rtc::Thread* signaling_thread,
       const std::string& content_name,
       const std::string* bundle_transport_name,
@@ -104,8 +104,8 @@
   // associated with the specified session.
   VideoChannel* CreateVideoChannel(
       webrtc::MediaControllerInterface* media_controller,
-      DtlsTransportInternal* rtp_transport,
-      DtlsTransportInternal* rtcp_transport,
+      TransportChannel* rtp_transport,
+      TransportChannel* rtcp_transport,
       rtc::Thread* signaling_thread,
       const std::string& content_name,
       const std::string* bundle_transport_name,
@@ -116,8 +116,8 @@
   void DestroyVideoChannel(VideoChannel* video_channel);
   RtpDataChannel* CreateRtpDataChannel(
       webrtc::MediaControllerInterface* media_controller,
-      DtlsTransportInternal* rtp_transport,
-      DtlsTransportInternal* rtcp_transport,
+      TransportChannel* rtp_transport,
+      TransportChannel* rtcp_transport,
       rtc::Thread* signaling_thread,
       const std::string& content_name,
       const std::string* bundle_transport_name,
@@ -167,8 +167,8 @@
   bool SetCryptoOptions_w(const rtc::CryptoOptions& crypto_options);
   VoiceChannel* CreateVoiceChannel_w(
       webrtc::MediaControllerInterface* media_controller,
-      DtlsTransportInternal* rtp_transport,
-      DtlsTransportInternal* rtcp_transport,
+      TransportChannel* rtp_transport,
+      TransportChannel* rtcp_transport,
       rtc::Thread* signaling_thread,
       const std::string& content_name,
       const std::string* bundle_transport_name,
@@ -178,8 +178,8 @@
   void DestroyVoiceChannel_w(VoiceChannel* voice_channel);
   VideoChannel* CreateVideoChannel_w(
       webrtc::MediaControllerInterface* media_controller,
-      DtlsTransportInternal* rtp_transport,
-      DtlsTransportInternal* rtcp_transport,
+      TransportChannel* rtp_transport,
+      TransportChannel* rtcp_transport,
       rtc::Thread* signaling_thread,
       const std::string& content_name,
       const std::string* bundle_transport_name,
@@ -189,8 +189,8 @@
   void DestroyVideoChannel_w(VideoChannel* video_channel);
   RtpDataChannel* CreateRtpDataChannel_w(
       webrtc::MediaControllerInterface* media_controller,
-      DtlsTransportInternal* rtp_transport,
-      DtlsTransportInternal* rtcp_transport,
+      TransportChannel* rtp_transport,
+      TransportChannel* rtcp_transport,
       rtc::Thread* signaling_thread,
       const std::string& content_name,
       const std::string* bundle_transport_name,