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

chrome/service/cloud_print/printer_job_queue_handler_unittest.cc

 // Copyright (c) 2013 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/service/cloud_print/printer_job_queue_handler.h"
 
 #include <set>
 
 #include "base/json/json_reader.h"
 #include "base/values.h"
@@ skipping 63 matching lines @@
 
   EXPECT_EQ(std::string("__testjob1"), jobs[0].job_id_);
   EXPECT_EQ(std::string("test1"), jobs[0].job_title_);
   EXPECT_EQ(std::string("http://example.com/job1ticket"),
             jobs[0].print_ticket_url_);
   EXPECT_EQ(std::string("http://example.com/job1data"),
             jobs[0].print_data_url_);
 
   std::set<std::string> expected_tags;
   expected_tags.insert("^own");
-  expected_tags.insert("");
+  expected_tags.insert(std::string());
   std::set<std::string> actual_tags;
   actual_tags.insert(jobs[0].tags_.begin(), jobs[0].tags_.end());
 
   EXPECT_EQ(expected_tags, actual_tags);
   EXPECT_EQ(base::TimeDelta(), jobs[0].time_remaining_);
 }
 
 TEST_F(PrinterJobQueueHandlerTest, PreferNonFailureTest) {
   TimeProviderMock* time_mock = new TimeProviderMock();
   PrinterJobQueueHandler job_queue_handler(time_mock);
@@ skipping 77 matching lines @@
                             base::TimeDelta::FromSeconds(4) + time_to_wait));
 
   job_queue_handler.GetJobsFromQueue(json_data_,
                                      &jobs);
 
   EXPECT_EQ(base::TimeDelta(), jobs[0].time_remaining_);
   EXPECT_EQ(std::string("__testjob2"),  jobs[0].job_id_);
 }
 
 }  // namespace cloud_print