Remove the fingerprint and ca_fingerprint from X509Certificate

ios/web/net/cert_store_impl.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_NET_CERT_STORE_IMPL_H_
 #define IOS_WEB_NET_CERT_STORE_IMPL_H_
 
 #include "base/macros.h"
 #include "base/memory/singleton.h"
 #include "ios/web/net/request_tracker_data_memoizing_store.h"
@@ skipping 13 matching lines @@
                     scoped_refptr<net::X509Certificate>* cert) override;
   void RemoveCertsForGroup(int group_id) override;
 
  protected:
   CertStoreImpl();
   ~CertStoreImpl() override;
 
  private:
   friend struct base::DefaultSingletonTraits<CertStoreImpl>;
 
-  RequestTrackerDataMemoizingStore<net::X509Certificate> store_;
+  // Utility structure that allows memoization to be based on the
+  // hash of |cert|'s certificate chain, to avoid needing to compare
+  // every certificate individually. This is purely an optimization.
+  class HashAndCert : public base::RefCountedThreadSafe<HashAndCert> {
+   public:
+    HashAndCert();
+
+    // Comparator for RendererDataMemoizingStore.
+    struct LessThan {
+      bool operator()(const scoped_refptr<HashAndCert>& lhs,
+                      const scoped_refptr<HashAndCert>& rhs) const;
+    };
+
+    net::SHA256HashValue chain_hash;
+    scoped_refptr<net::X509Certificate> cert;
+
+   private:
+    friend class base::RefCountedThreadSafe<HashAndCert>;
+
+    ~HashAndCert();
+  };
+  RequestTrackerDataMemoizingStore<HashAndCert> store_;
 
   DISALLOW_COPY_AND_ASSIGN(CertStoreImpl);
 };
 
 }  // namespace web
 
 #endif  // IOS_WEB_NET_CERT_STORE_IMPL_H_