Rename "PacketTransportInterface" to "PacketTransportInternal".

webrtc/p2p/base/dtlstransportinternal.h

Index: webrtc/p2p/base/dtlstransportinternal.h
diff --git a/webrtc/p2p/base/dtlstransportinternal.h b/webrtc/p2p/base/dtlstransportinternal.h
index 74fdd6dfcfd9403bc431006bfbe178566833bb4f..483a92898e2e1910bf10adcac7884ddc7fd57229 100644
--- a/webrtc/p2p/base/dtlstransportinternal.h
+++ b/webrtc/p2p/base/dtlstransportinternal.h
@@ -18,7 +18,7 @@
 #include "webrtc/base/sslstreamadapter.h"
 #include "webrtc/p2p/base/icetransportinternal.h"
 #include "webrtc/p2p/base/jseptransport.h"
-#include "webrtc/p2p/base/packettransportinterface.h"
+#include "webrtc/p2p/base/packettransportinternal.h"
 
 namespace cricket {
 
@@ -32,7 +32,7 @@ enum PacketFlags {
 // Once the public interface is supported,
 // (https://www.w3.org/TR/webrtc/#rtcdtlstransport-interface)
 // the DtlsTransportInterface will be split from this class.
-class DtlsTransportInternal : public rtc::PacketTransportInterface {
+class DtlsTransportInternal : public rtc::PacketTransportInternal {
  public:
   virtual ~DtlsTransportInternal() {}