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

chrome/browser/shell_integration_unittest.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/shell_integration.h"
 
 #include <cstdlib>
 #include <map>
 
 #include "base/file_util.h"
@@ skipping 626 matching lines @@
   env.Set("LANGUAGE", "en_AU.UTF-8");
 
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(test_cases); i++) {
     SCOPED_TRACE(i);
     EXPECT_EQ(
         test_cases[i].expected_output,
         ShellIntegrationLinux::GetDesktopFileContents(
             test_cases[i].template_contents,
             web_app::GenerateApplicationNameFromURL(GURL(test_cases[i].url)),
             GURL(test_cases[i].url),
-            "",
+            std::string(),
             base::FilePath(),
             ASCIIToUTF16(test_cases[i].title),
             test_cases[i].icon_name,
             base::FilePath(),
             test_cases[i].nodisplay));
   }
 }
 
 #endif