Remove PeerConnectionIdentityStore and related messaging/storage code.

content/renderer/media/peer_connection_identity_store.h

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CONTENT_RENDERER_MEDIA_PEER_CONNECTION_IDENTITY_STORE_H_
-#define CONTENT_RENDERER_MEDIA_PEER_CONNECTION_IDENTITY_STORE_H_
-
-#include "base/macros.h"
-#include "base/single_thread_task_runner.h"
-#include "base/threading/thread_checker.h"
-#include "third_party/webrtc/api/dtlsidentitystore.h"
-#include "third_party/webrtc/base/optional.h"
-#include "url/gurl.h"
-
-namespace content {
-
-// This class is associated with a peer connection and handles WebRTC DTLS
-// identity requests by delegating to the per-renderer WebRTCIdentityProxy.
-// TODO(hbos): Remove this store, it is no longer used.
-// See bugs.webrtc.org/5707, bugs.webrtc.org/5708.
-class PeerConnectionIdentityStore
-    : public webrtc::DtlsIdentityStoreInterface {
- public:
-  PeerConnectionIdentityStore(
-      const scoped_refptr<base::SingleThreadTaskRunner>& main_thread,
-      const scoped_refptr<base::SingleThreadTaskRunner>& signaling_thread,
-      const GURL& origin,
-      const GURL& first_party_for_cookies);
-  ~PeerConnectionIdentityStore() override;
-
-  // webrtc::DtlsIdentityStoreInterface override;
-  void RequestIdentity(
-      const rtc::KeyParams& key_params,
-      const rtc::Optional<uint64_t>& expires_ms,
-      const rtc::scoped_refptr<webrtc::DtlsIdentityRequestObserver>& observer)
-          override;
-
- private:
-  const scoped_refptr<base::SingleThreadTaskRunner> main_thread_;
-  const scoped_refptr<base::SingleThreadTaskRunner> signaling_thread_;
-  const GURL url_;
-  const GURL first_party_for_cookies_;
-
-  DISALLOW_COPY_AND_ASSIGN(PeerConnectionIdentityStore);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_RENDERER_MEDIA_PEER_CONNECTION_IDENTITY_STORE_H_