Revert of Replacing DtlsIdentityStoreInterface with RTCCertificateGeneratorInterface.

webrtc/api/webrtcsession_unittest.cc

Index: webrtc/api/webrtcsession_unittest.cc
diff --git a/webrtc/api/webrtcsession_unittest.cc b/webrtc/api/webrtcsession_unittest.cc
index 571e1994f441a6defbe21ba292ae3fa67ae25507..4207c24234c741468e2ebf0917a3b3bc19d2563a 100644
--- a/webrtc/api/webrtcsession_unittest.cc
+++ b/webrtc/api/webrtcsession_unittest.cc
@@ -397,10 +397,7 @@
     EXPECT_EQ(PeerConnectionInterface::kIceGatheringNew,
         observer_.ice_gathering_state_);
 
-    std::unique_ptr<rtc::RTCCertificateGeneratorInterface> cert_generator(
-        dtls_identity_store ? new webrtc::RTCCertificateGeneratorStoreWrapper(
-            std::move(dtls_identity_store)) : nullptr);
-    EXPECT_TRUE(session_->Initialize(options_, std::move(cert_generator),
+    EXPECT_TRUE(session_->Initialize(options_, std::move(dtls_identity_store),
                                      configuration_));
     session_->set_metrics_observer(metrics_observer_);
   }