Fix some non-const ref function argument types.

net/cert/multi_log_ct_verifier_unittest.cc

 // Copyright 2013 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 "net/cert/multi_log_ct_verifier.h"
 
 #include <memory>
 #include <string>
 
 #include "base/files/file_path.h"
@@ skipping 55 matching lines @@
         der_test_cert.length());
     ASSERT_TRUE(chain_.get());
 
     embedded_sct_chain_ =
         CreateCertificateChainFromFile(GetTestCertsDirectory(),
                                        "ct-test-embedded-cert.pem",
                                        X509Certificate::FORMAT_AUTO);
     ASSERT_TRUE(embedded_sct_chain_.get());
   }
 
-  bool CheckForEmbeddedSCTInNetLog(TestNetLog& net_log) {
+  bool CheckForEmbeddedSCTInNetLog(const TestNetLog& net_log) {
     TestNetLogEntry::List entries;
     net_log.GetEntries(&entries);
     if (entries.size() != 2)
       return false;
 
     const TestNetLogEntry& received = entries[0];
     std::string embedded_scts;
     if (!received.GetStringValue("embedded_scts", &embedded_scts))
       return false;
     if (embedded_scts.empty())
@@ skipping 199 matching lines @@
   Mock::VerifyAndClearExpectations(&observer);
 
   EXPECT_CALL(observer, OnSCTVerified(embedded_sct_chain_.get(), _)).Times(0);
   verifier_->SetObserver(nullptr);
   ASSERT_TRUE(VerifySinglePrecertificateChain(embedded_sct_chain_));
 }
 
 }  // namespace
 
 }  // namespace net