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

chrome/browser/tab_contents/spelling_menu_observer_browsertest.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/browser/tab_contents/spelling_menu_observer.h"
 
 #include <vector>
 
 #include "base/command_line.h"
 #include "base/prefs/pref_service.h"
@@ skipping 283 matching lines @@
 // Tests that right-clicking a misspelled word when we enable spelling-service
 // integration to verify an item "Ask Google for suggestions" is checked. (This
 // test does not actually send JSON-RPC requests to the service because it makes
 // this test flaky.)
 IN_PROC_BROWSER_TEST_F(SpellingMenuObserverTest, EnableSpellingService) {
   scoped_ptr<MockRenderViewContextMenu> menu(new MockRenderViewContextMenu);
   scoped_ptr<SpellingMenuObserver> observer(
       new SpellingMenuObserver(menu.get()));
   menu->SetObserver(observer.get());
   menu->GetPrefs()->SetBoolean(prefs::kSpellCheckUseSpellingService, true);
-  menu->GetPrefs()->SetString(prefs::kSpellCheckDictionary, "");
+  menu->GetPrefs()->SetString(prefs::kSpellCheckDictionary, std::string());
 
   content::ContextMenuParams params;
   params.is_editable = true;
   params.misspelled_word = ASCIIToUTF16("wiimode");
   observer->InitMenu(params);
   EXPECT_EQ(static_cast<size_t>(4), menu->GetMenuSize());
 
   // To avoid duplicates, this test reads only the "Ask Google for suggestions"
   // item and verifies it is enabled and checked.
   MockRenderViewContextMenu::MockMenuItem item;
@@ skipping 210 matching lines @@
   menu->CreateRequestContext();
   observer->InitMenu(params);
 
   // Should have at least 2 entries. Separator, suggestion.
   EXPECT_LT(2U, menu->GetMenuSize());
   menu->GetMenuItem(0, &item);
   EXPECT_EQ(-1, item.command_id);
   menu->GetMenuItem(1, &item);
   EXPECT_EQ(IDC_CONTENT_CONTEXT_SPELLING_SUGGESTION, item.command_id);
 }