Rewrite WebRtcSession DTLS/SDES crypto tests as PeerConnection tests

Bug: webrtc:8222
Change-Id: I6be2c5a5735b77a5c577472b88ff830204dd69eb
Reviewed-on: https://webrtc-review.googlesource.com/1160
Commit-Queue: Steve Anton <steveanton@webrtc.org>
Reviewed-by: Taylor Brandstetter <deadbeef@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#20193}
diff --git a/pc/BUILD.gn b/pc/BUILD.gn
index 1bfa37c..6e95bf8 100644
--- a/pc/BUILD.gn
+++ b/pc/BUILD.gn
@@ -391,6 +391,7 @@
       "localaudiosource_unittest.cc",
       "mediaconstraintsinterface_unittest.cc",
       "mediastream_unittest.cc",
+      "peerconnection_crypto_unittest.cc",
       "peerconnection_integrationtest.cc",
       "peerconnectionendtoend_unittest.cc",
       "peerconnectionfactory_unittest.cc",