Stop using CertStore which is not compatible with PlzNavigate.

ios/web/public/cert_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 IOS_WEB_PUBLIC_BROWSER_CERT_STORE_H_
-#define IOS_WEB_PUBLIC_BROWSER_CERT_STORE_H_
-
-#include "base/memory/ref_counted.h"
-
-namespace net {
-class X509Certificate;
-}
-
-namespace web {
-
-// The purpose of the cert store is to provide an easy way to store/retrieve
-// X509Certificate objects. When stored, an X509Certificate object is
-// associated with a group, which can be cleared when it is no longer useful.
-// It can be accessed from the UI and IO threads (it is thread-safe).
-// Note that the cert ids will overflow if more than 2^32 - 1 certs are
-// registered in one browsing session (which is highly unlikely to happen).
-class CertStore {
- public:
-  // Returns the singleton instance of the CertStore.
-  static CertStore* GetInstance();
-
-  // Stores the specified cert and returns the id associated with it.  The cert
-  // is associated to the specified RequestTracker.
-  // When all the RequestTrackers associated with a cert have been closed, the
-  // cert is removed from the store.
-  // Note: ids starts at 1.
-  virtual int StoreCert(net::X509Certificate* cert, int group_id) = 0;
-
-  // Tries to retrieve the previously stored cert associated with the specified
-  // |cert_id|. Returns whether the cert could be found, and, if |cert| is
-  // non-nullptr, copies it in.
-  virtual bool RetrieveCert(int cert_id,
-                            scoped_refptr<net::X509Certificate>* cert) = 0;
-
-  // Removes all the certs associated with the specified groups from the store.
-  virtual void RemoveCertsForGroup(int group_id) = 0;
-
- protected:
-  virtual ~CertStore() {}
-};
-
-}  // namespace web
-
-#endif  // IOS_WEB_PUBLIC_BROWSER_CERT_STORE_H_