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

chrome/browser/logging_chrome_browsertest.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 "base/command_line.h"
 #include "base/environment.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/common/env_vars.h"
 #include "chrome/common/logging_chrome.h"
@@ skipping 26 matching lines @@
     scoped_ptr<base::Environment> env(base::Environment::Create());
     env->SetVar(env_vars::kLogFileName, environment_filename_);
   }
 
  private:
   std::string environment_filename_;  // Saves real environment value.
 };
 
 // Tests the log file name getter without an environment variable.
 TEST_F(ChromeLoggingTest, LogFileName) {
-  SaveEnvironmentVariable("");
+  SaveEnvironmentVariable(std::string());
 
   base::FilePath filename = logging::GetLogFileName();
   ASSERT_NE(base::FilePath::StringType::npos,
             filename.value().find(FILE_PATH_LITERAL("chrome_debug.log")));
 
   RestoreEnvironmentVariable();
 }
 
 // Tests the log file name getter with an environment variable.
 TEST_F(ChromeLoggingTest, EnvironmentLogFileName) {
@@ skipping 33 matching lines @@
 
 // Flaky, http://crbug.com/107226 .
 IN_PROC_BROWSER_TEST_F(RendererCrashTest, DISABLED_Crash) {
   registrar_.Add(this, content::NOTIFICATION_RENDERER_PROCESS_CLOSED,
                  content::NotificationService::AllSources());
   ui_test_utils::NavigateToURLWithDisposition(
       browser(), GURL(content::kChromeUICrashURL), CURRENT_TAB, 0);
   content::RunMessageLoop();
   ASSERT_TRUE(saw_crash_);
 }