Move ReadFileToString to the base namespace.

chromeos/network/client_cert_resolver_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 "chromeos/network/client_cert_resolver.h"
 
 #include <cert.h>
 #include <pk11pub.h>
 
 #include "base/file_util.h"
 #include "base/files/file_path.h"
@@ skipping 86 matching lines @@
         ca_cert_list, net::NSSCertDatabase::TRUST_DEFAULT, &failures));
     ASSERT_TRUE(failures.empty()) << net::ErrorToString(failures[0].net_error);
 
     net::X509Certificate::GetPEMEncoded(ca_cert_list[0]->os_cert_handle(),
                                         &test_ca_cert_pem_);
     ASSERT_TRUE(!test_ca_cert_pem_.empty());
 
     // Import a client cert signed by that CA.
     scoped_refptr<net::CryptoModule> crypt_module = cert_db->GetPrivateModule();
     std::string pkcs12_data;
-    ASSERT_TRUE(file_util::ReadFileToString(
+    ASSERT_TRUE(base::ReadFileToString(
         net::GetTestCertsDirectory().Append("websocket_client_cert.p12"),
         &pkcs12_data));
 
     net::CertificateList client_cert_list;
     ASSERT_EQ(net::OK,
               cert_db->ImportFromPKCS12(crypt_module.get(),
                                         pkcs12_data,
                                         string16(),
                                         false,
                                         &client_cert_list));
@@ skipping 154 matching lines @@
   message_loop_.RunUntilIdle();
 
   // Verify that the resolver positively matched the pattern in the policy with
   // the test client cert and configured the network.
   std::string pkcs11_id;
   GetClientCertProperties(&pkcs11_id);
   EXPECT_EQ(test_pkcs11_id_, pkcs11_id);
 }
 
 }  // namespace chromeos