Continue to clean c_str() calls.

printing/backend/print_backend_chromeos.cc

 // Copyright 2016 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 "printing/backend/print_backend.h"
 
 #include "base/logging.h"
 #include "base/values.h"
 #include "printing/backend/print_backend_consts.h"
 #include "url/gurl.h"
@@ skipping 77 matching lines @@
     std::string cups_blocking;
     int encryption = HTTP_ENCRYPT_NEVER;
     if (print_backend_settings) {
       print_backend_settings->GetString(kCUPSPrintServerURL,
                                         &print_server_url_str);
 
       print_backend_settings->GetString(kCUPSBlocking, &cups_blocking);
 
       print_backend_settings->GetInteger(kCUPSEncryption, &encryption);
     }
-    GURL print_server_url(print_server_url_str.c_str());
+    GURL print_server_url(print_server_url_str);
 
     std::unique_ptr<CupsConnection> connection =
         base::MakeUnique<CupsConnection>(
             print_server_url, static_cast<http_encryption_t>(encryption),
             cups_blocking == kValueTrue);
 
     return new PrintBackendCupsIpp(std::move(connection));
 #endif  // defined(USE_CUPS)
   }
 
   return new PrintBackendChromeOS();
 }
 
 }  // namespace printing