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

chrome/browser/spellchecker/spelling_service_client_unittest.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 <string>
 #include <vector>
 
 #include "base/bind.h"
 #include "base/json/json_reader.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 325 matching lines @@
   EXPECT_FALSE(client_.IsAvailable(&profile_, kSpellcheck));
 
   pref->SetBoolean(prefs::kEnableContinuousSpellcheck, true);
   pref->SetBoolean(prefs::kSpellCheckUseSpellingService, true);
 
   // For locales supported by the SpellCheck service, this function returns
   // false for suggestions and true for spellcheck. (The comment in
   // SpellingServiceClient::IsAvailable() describes why this function returns
   // false for suggestions.) If there is no language set, then we
   // do not allow any remote.
-  pref->SetString(prefs::kSpellCheckDictionary, "");
+  pref->SetString(prefs::kSpellCheckDictionary, std::string());
   EXPECT_FALSE(client_.IsAvailable(&profile_, kSuggest));
   EXPECT_FALSE(client_.IsAvailable(&profile_, kSpellcheck));
 
   static const char* kSupported[] = {
 #if !defined(OS_MACOSX)
     "en-AU", "en-CA", "en-GB", "en-US",
 #endif
   };
   // If spellcheck is allowed, then suggest is not since spellcheck is a
   // superset of suggest.
@@ skipping 13 matching lines @@
     "ro-RO", "ru-RU", "sk-SK", "sl-SI", "sh", "sr", "sv-SE", "tr-TR",
     "uk-UA", "vi-VN",
 #endif
   };
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kUnsupported); ++i) {
     pref->SetString(prefs::kSpellCheckDictionary, kUnsupported[i]);
     EXPECT_TRUE(client_.IsAvailable(&profile_, kSuggest));
     EXPECT_FALSE(client_.IsAvailable(&profile_, kSpellcheck));
   }
 }