Refactoring that removes P2PTransport and DtlsTransport classes.

webrtc/BUILD.gn

Index: webrtc/BUILD.gn
diff --git a/webrtc/BUILD.gn b/webrtc/BUILD.gn
index fc7885ed63cf958dfaf5035adfac3e2e4ae90386..accd2c91d7b72e9810d487ab0ed1f641847df6de 100644
--- a/webrtc/BUILD.gn
+++ b/webrtc/BUILD.gn
@@ -449,6 +449,7 @@ if (rtc_include_tests) {
       "p2p/base/dtlstransportchannel_unittest.cc",
       "p2p/base/fakeportallocator.h",
       "p2p/base/faketransportcontroller.h",
+      "p2p/base/jseptransport_unittest.cc",
       "p2p/base/p2ptransportchannel_unittest.cc",
       "p2p/base/port_unittest.cc",
       "p2p/base/portallocator_unittest.cc",
@@ -463,7 +464,6 @@ if (rtc_include_tests) {
       "p2p/base/testrelayserver.h",
       "p2p/base/teststunserver.h",
       "p2p/base/testturnserver.h",
-      "p2p/base/transport_unittest.cc",
       "p2p/base/transportcontroller_unittest.cc",
       "p2p/base/transportdescriptionfactory_unittest.cc",
       "p2p/base/turnport_unittest.cc",