Remove the test-only X509Certificate constructor

ios/web/net/request_tracker_impl_unittest.mm

 // Copyright 2012 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.
 
 #include "ios/web/net/request_tracker_impl.h"
 
 #include <stddef.h>
 
 #include "base/logging.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 470 matching lines @@
  private:
   ~MockCertificatePolicyCache() override {}
 };
 
 void TwoStartsSSLCallback(bool* called, bool ok) {
   *called = true;
 }
 
 // crbug/386180
 TEST_F(RequestTrackerTest, DISABLED_TwoStartsNoEstimate) {
-  net::X509Certificate* cert =
-      new net::X509Certificate("subject", "issuer", base::Time::Now(),
-                               base::Time::Max());
   net::SSLInfo ssl_info;
-  ssl_info.cert = cert;
+  ssl_info.cert =
+      net::ImportCertFromFile(net::GetTestCertsDirectory(), "ok_cert.pem");
   ssl_info.cert_status = net::CERT_STATUS_AUTHORITY_INVALID;
   scoped_refptr<MockCertificatePolicyCache> cache;
   tracker_->SetCertificatePolicyCacheForTest(cache.get());
   TrimRequest(request_group_id_, GetSecureURL(0));
   tracker_->StartRequest(GetSecureRequest(0));
   tracker_->StartRequest(GetSecureRequest(1));
   bool request_0_called = false;
   bool request_1_called = false;
   tracker_->OnSSLCertificateError(GetSecureRequest(0), ssl_info, true,
                                   base::Bind(&TwoStartsSSLCallback,
                                              &request_0_called));
   tracker_->OnSSLCertificateError(GetSecureRequest(1), ssl_info, true,
                                   base::Bind(&TwoStartsSSLCallback,
                                              &request_1_called));
   EXPECT_TRUE(request_0_called);
   EXPECT_TRUE(request_1_called);
 }
 
 }  // namespace