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

chrome/test/chromedriver/command_executor_impl_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 <string>
 
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
@@ skipping 100 matching lines @@
 
 TEST(CommandExecutorImplTest, CommandThatReturnsError) {
   CommandExecutorImpl executor;
   executor.command_map_.Set("simpleCommand",
                             base::Bind(&ExecuteSimpleCommand3));
 
   base::DictionaryValue params;
   StatusCode status_code;
   scoped_ptr<base::Value> value;
   std::string out_session_id;
-  executor.ExecuteCommand("simpleCommand", params, "",
-                          &status_code, &value,
+  executor.ExecuteCommand("simpleCommand",
+                          params,
+                          std::string(),
+                          &status_code,
+                          &value,
                           &out_session_id);
   ASSERT_EQ(kUnknownError, status_code);
   ASSERT_TRUE(value);
   base::DictionaryValue* error;
   ASSERT_TRUE(value->GetAsDictionary(&error));
   std::string message;
   ASSERT_TRUE(error->GetString("message", &message));
   ASSERT_NE(std::string::npos, message.find("unknown error"));
 }