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

chrome/test/chromedriver/session.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/test/chromedriver/session.h"
 
 #include <list>
 
 #include "base/values.h"
 #include "chrome/test/chromedriver/chrome/chrome.h"
@@ skipping 49 matching lines @@
 void Session::SwitchToSubFrame(const std::string& frame_id,
                                const std::string& chromedriver_frame_id) {
   std::string parent_frame_id;
   if (!frames.empty())
     parent_frame_id = frames.back().frame_id;
   frames.push_back(FrameInfo(parent_frame_id, frame_id, chromedriver_frame_id));
 }
 
 std::string Session::GetCurrentFrameId() const {
   if (frames.empty())
-    return "";
+    return std::string();
   return frames.back().frame_id;
 }
 
 scoped_ptr<base::DictionaryValue> Session::CreateCapabilities() {
   scoped_ptr<base::DictionaryValue> caps(new base::DictionaryValue());
   caps->SetString("browserName", "chrome");
   caps->SetString("version", chrome->GetVersion());
   caps->SetString("driverVersion", kChromeDriverVersion);
   caps->SetString("platform", chrome->GetOperatingSystemName());
   caps->SetBoolean("javascriptEnabled", true);
@@ skipping 17 matching lines @@
 Session* SessionAccessorImpl::Access(scoped_ptr<base::AutoLock>* lock) {
   lock->reset(new base::AutoLock(session_lock_));
   return session_.get();
 }
 
 void SessionAccessorImpl::DeleteSession() {
   session_.reset();
 }
 
 SessionAccessorImpl::~SessionAccessorImpl() {}