Added DtlsCertificate, a ref counted object owning an SSLIdentity

webrtc/p2p/base/dtlstransportchannel.h

Index: webrtc/p2p/base/dtlstransportchannel.h
diff --git a/webrtc/p2p/base/dtlstransportchannel.h b/webrtc/p2p/base/dtlstransportchannel.h
index 1bf77b6566a44cf958aa38e9535a1fd098f4cd43..e8683dc7a9236931516e401c3d0593351645ceef 100644
--- a/webrtc/p2p/base/dtlstransportchannel.h
+++ b/webrtc/p2p/base/dtlstransportchannel.h
@@ -99,8 +99,10 @@ class DtlsTransportChannelWrapper : public TransportChannelImpl {
   virtual IceRole GetIceRole() const {
     return channel_->GetIceRole();
   }
-  virtual bool SetLocalIdentity(rtc::SSLIdentity *identity);
-  virtual bool GetLocalIdentity(rtc::SSLIdentity** identity) const;
+  bool SetLocalCertificate(
+      const rtc::scoped_refptr<webrtc::DtlsCertificate>& certificate) override;
+  bool GetLocalCertificate(
+      rtc::scoped_refptr<webrtc::DtlsCertificate>* certificate) const override;
 
   virtual bool SetRemoteFingerprint(const std::string& digest_alg,
                                     const uint8* digest,
@@ -236,7 +238,7 @@ class DtlsTransportChannelWrapper : public TransportChannelImpl {
   StreamInterfaceChannel* downward_;  // Wrapper for channel_, owned by dtls_.
   std::vector<std::string> srtp_ciphers_;  // SRTP ciphers to use with DTLS.
   State dtls_state_;
-  rtc::SSLIdentity* local_identity_;
+  rtc::scoped_refptr<webrtc::DtlsCertificate> local_certificate_;
   rtc::SSLRole ssl_role_;
   rtc::SSLProtocolVersion ssl_max_version_;
   rtc::Buffer remote_fingerprint_value_;