Remove DtlsIdentityStoreInterface, it is no longer used.

webrtc/api/webrtcsession_unittest.cc

 /*
  *  Copyright 2012 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.
  */
 
@@ skipping 43 matching lines @@
   }
 
 using cricket::FakeVoiceMediaChannel;
 using cricket::TransportInfo;
 using rtc::SocketAddress;
 using rtc::Thread;
 using webrtc::CreateSessionDescription;
 using webrtc::CreateSessionDescriptionObserver;
 using webrtc::CreateSessionDescriptionRequest;
 using webrtc::DataChannel;
-using webrtc::DtlsIdentityStoreInterface;
 using webrtc::FakeMetricsObserver;
 using webrtc::IceCandidateCollection;
 using webrtc::InternalDataChannelInit;
 using webrtc::JsepIceCandidate;
 using webrtc::JsepSessionDescription;
 using webrtc::PeerConnectionFactoryInterface;
 using webrtc::PeerConnectionInterface;
 using webrtc::SessionDescriptionInterface;
 using webrtc::SessionStats;
 using webrtc::StreamCollection;
@@ skipping 4184 matching lines @@
 }
 
 // TODO(bemasc): Add a TestIceStatesBundle with BUNDLE enabled.  That test
 // currently fails because upon disconnection and reconnection OnIceComplete is
 // called more than once without returning to IceGatheringGathering.
 
 INSTANTIATE_TEST_CASE_P(WebRtcSessionTests,
                         WebRtcSessionTest,
                         testing::Values(ALREADY_GENERATED,
                                         DTLS_IDENTITY_STORE));