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

chrome/browser/nacl_host/pnacl_file_host_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/nacl_host/pnacl_file_host.h"
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/path_service.h"
@@ skipping 39 matching lines @@
   const char non_ascii[] = "\xff\xfe";
   EXPECT_FALSE(PnaclCanOpenFile(non_ascii, &out_path));
 
   // Check file length restriction.
   EXPECT_FALSE(PnaclCanOpenFile("thisstringisactuallywaaaaaaaaaaaaaaaaaaaaaaaa"
                                 "toolongwaytoolongwaaaaayyyyytoooooooooooooooo"
                                 "looooooooong",
                                 &out_path));
 
   // Other bad files.
-  EXPECT_FALSE(PnaclCanOpenFile("", &out_path));
+  EXPECT_FALSE(PnaclCanOpenFile(std::string(), &out_path));
   EXPECT_FALSE(PnaclCanOpenFile(".", &out_path));
   EXPECT_FALSE(PnaclCanOpenFile("..", &out_path));
 #if defined(OS_WIN)
   EXPECT_FALSE(PnaclCanOpenFile("..\\llc", &out_path));
   EXPECT_FALSE(PnaclCanOpenFile("%SystemRoot%", &out_path));
   EXPECT_FALSE(PnaclCanOpenFile("%SystemRoot%\\explorer.exe", &out_path));
 #else
   EXPECT_FALSE(PnaclCanOpenFile("../llc", &out_path));
   EXPECT_FALSE(PnaclCanOpenFile("/bin/sh", &out_path));
   EXPECT_FALSE(PnaclCanOpenFile("$HOME", &out_path));
   EXPECT_FALSE(PnaclCanOpenFile("$HOME/.bashrc", &out_path));
 #endif
 }