Remove DtlsIdentityStoreInterface, it is no longer used.

webrtc/api/dtlsidentitystore.h

-/*
- *  Copyright 2015 The WebRTC project authors. All Rights Reserved.
- *
- *  Use of this source code is governed by a BSD-style license
- *  that can be found in the LICENSE file in the root of the source
- *  tree. An additional intellectual property rights grant can be found
- *  in the file PATENTS.  All contributing project authors may
- *  be found in the AUTHORS file in the root of the source tree.
- */
-
-#ifndef WEBRTC_API_DTLSIDENTITYSTORE_H_
-#define WEBRTC_API_DTLSIDENTITYSTORE_H_
-
-#include <memory>
-#include <queue>
-#include <string>
-#include <utility>
-
-#include "webrtc/base/messagehandler.h"
-#include "webrtc/base/messagequeue.h"
-#include "webrtc/base/optional.h"
-#include "webrtc/base/refcount.h"
-#include "webrtc/base/rtccertificategenerator.h"
-#include "webrtc/base/scoped_ref_ptr.h"
-#include "webrtc/base/sslidentity.h"
-#include "webrtc/base/thread.h"
-
-namespace webrtc {
-
-class SSLIdentity;
-class Thread;
-
-// Used to receive callbacks of DTLS identity requests.
-class DtlsIdentityRequestObserver : public rtc::RefCountInterface {
- public:
-  virtual void OnFailure(int error) = 0;
-  // TODO(hbos): Unify the OnSuccess method once Chrome code is updated.
-  virtual void OnSuccess(const std::string& der_cert,
-                         const std::string& der_private_key) = 0;
-  // |identity| is a unique_ptr because rtc::SSLIdentity is not copyable and the
-  // client has to get the ownership of the object to make use of it.
-  virtual void OnSuccess(std::unique_ptr<rtc::SSLIdentity> identity) = 0;
-
- protected:
-  virtual ~DtlsIdentityRequestObserver() {}
-};
-
-// This interface defines an in-memory DTLS identity store, which generates DTLS
-// identities.
-// APIs calls must be made on the signaling thread and the callbacks are also
-// called on the signaling thread.
-class DtlsIdentityStoreInterface {
- public:
-  virtual ~DtlsIdentityStoreInterface() { }
-
-  // The |observer| will be called when the requested identity is ready, or when
-  // identity generation fails.
-  virtual void RequestIdentity(
-      const rtc::KeyParams& key_params,
-      const rtc::Optional<uint64_t>& expires_ms,
-      const rtc::scoped_refptr<DtlsIdentityRequestObserver>& observer) = 0;
-};
-
-}  // namespace webrtc
-
-#endif  // WEBRTC_API_DTLSIDENTITYSTORE_H_