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

chrome/test/webdriver/commands/set_timeout_commands_unittest.cc

 // Copyright (c) 2011 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 <vector>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "chrome/test/webdriver/commands/response.h"
@@ skipping 37 matching lines @@
   ASSERT_EQ(expected_timeout, test_session.implicit_wait());
 }
 
 }  // namespace
 
 TEST(ImplicitWaitCommandTest, SettingImplicitWaits) {
   Session test_session;
   ASSERT_EQ(0, test_session.implicit_wait()) << "Sanity check failed";
 
   std::vector<std::string> path_segments;
-  path_segments.push_back("");
+  path_segments.push_back(std::string());
   path_segments.push_back("session");
   path_segments.push_back(test_session.id());
   path_segments.push_back("timeouts");
   path_segments.push_back("implicitly_wait");
 
   base::DictionaryValue* parameters =
       new base::DictionaryValue;  // Owned by |command|.
   ImplicitWaitCommand command(path_segments, parameters);
 
   AssertIsAbleToInitialize(&command);
@@ skipping 14 matching lines @@
 
   parameters->SetInteger("ms", 1);
   AssertTimeoutSet(test_session, 1, &command);
   parameters->SetDouble("ms", 2.5);
   AssertTimeoutSet(test_session, 2, &command);
   parameters->SetInteger("ms", 0);
   AssertTimeoutSet(test_session, 0, &command);
 }
 
 }  // namespace webdriver