Rewrite std::string("") to std::string(), Linux edition.

chrome/browser/ui/certificate_dialogs.cc

 // Copyright (c) 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 "chrome/browser/ui/certificate_dialogs.h"
 
 
 #include <vector>
 
 #include "base/base64.h"
@@ skipping 34 matching lines @@
     result.append("\r\n");
   }
   return result;
 }
 
 std::string GetBase64String(net::X509Certificate::OSCertHandle cert) {
   std::string base64;
   if (!base::Base64Encode(
       x509_certificate_model::GetDerString(cert), &base64)) {
     LOG(ERROR) << "base64 encoding error";
-    return "";
+    return std::string();
   }
   return "-----BEGIN CERTIFICATE-----\r\n" +
       WrapAt64(base64) +
       "-----END CERTIFICATE-----\r\n";
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // General utility functions.
 
 class Exporter : public ui::SelectFileDialog::Listener {
@@ skipping 113 matching lines @@
       suggested_path, &file_type_info, 1,
       FILE_PATH_LITERAL("crt"),
       parent, params);
 }
 
 void ShowCertExportDialog(WebContents* web_contents,
                           gfx::NativeWindow parent,
                           net::X509Certificate::OSCertHandle cert) {
   new Exporter(web_contents, parent, cert);
 }