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

base/prefs/pref_service_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 "base/prefs/json_pref_store.h"
 #include "base/prefs/mock_pref_change_callback.h"
 #include "base/prefs/pref_change_registrar.h"
 #include "base/prefs/pref_registry_simple.h"
@@ skipping 27 matching lines @@
   prefs.SetString(pref_name, new_pref_value);
   Mock::VerifyAndClearExpectations(&obs);
 
   // Setting the pref to the same value should not set the pref value a second
   // time.
   EXPECT_CALL(obs, OnPreferenceChanged(_)).Times(0);
   prefs.SetString(pref_name, new_pref_value);
   Mock::VerifyAndClearExpectations(&obs);
 
   // Clearing the pref should cause the pref to fire.
-  const StringValue expected_default_value("");
+  const StringValue expected_default_value((std::string()));
   obs.Expect(pref_name, &expected_default_value);
   prefs.ClearPref(pref_name);
   Mock::VerifyAndClearExpectations(&obs);
 
   // Clearing the pref again should not cause the pref to fire.
   EXPECT_CALL(obs, OnPreferenceChanged(_)).Times(0);
   prefs.ClearPref(pref_name);
   Mock::VerifyAndClearExpectations(&obs);
 }
 
@@ skipping 248 matching lines @@
 
   EXPECT_CALL(observer_, OnPreferenceChanged(_)).Times(0);
   prefs_.Set(kName, new_value);
   Mock::VerifyAndClearExpectations(&observer_);
 
   ListValue empty;
   observer_.Expect(kName, &empty);
   prefs_.Set(kName, empty);
   Mock::VerifyAndClearExpectations(&observer_);
 }