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

chrome/test/base/ui_test_utils.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/base/ui_test_utils.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #endif
 
@@ skipping 169 matching lines @@
 }  // namespace
 
 bool GetCurrentTabTitle(const Browser* browser, string16* title) {
   WebContents* web_contents =
       browser->tab_strip_model()->GetActiveWebContents();
   if (!web_contents)
     return false;
   NavigationEntry* last_entry = web_contents->GetController().GetActiveEntry();
   if (!last_entry)
     return false;
-  title->assign(last_entry->GetTitleForDisplay(""));
+  title->assign(last_entry->GetTitleForDisplay(std::string()));
   return true;
 }
 
 void WaitForNavigations(NavigationController* controller,
                         int number_of_navigations) {
   content::TestNavigationObserver observer(
       content::Source<NavigationController>(controller),
       number_of_navigations);
   base::RunLoop run_loop;
   observer.WaitForObservation(
@@ skipping 487 matching lines @@
 void HistoryEnumerator::HistoryQueryComplete(
     const base::Closure& quit_task,
     HistoryService::Handle request_handle,
     history::QueryResults* results) {
   for (size_t i = 0; i < results->size(); ++i)
     urls_.push_back((*results)[i].url());
   quit_task.Run();
 }
 
 }  // namespace ui_test_utils