Cleanup: Remove std::string("") usage.

chromeos/network/network_configuration_handler_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 "base/bind.h"
 #include "base/json/json_writer.h"
 #include "base/message_loop/message_loop.h"
 #include "base/strings/string_piece.h"
 #include "base/values.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
@@ skipping 341 matching lines @@
   value.SetWithoutPathExpansion(shill::kProfileProperty,
                                 base::Value::CreateStringValue(profile));
 
   EXPECT_CALL(*mock_manager_client_,
               ConfigureServiceForProfile(dbus::ObjectPath(profile), _, _, _))
       .WillOnce(
            Invoke(this, &NetworkConfigurationHandlerTest::OnConfigureService));
   network_configuration_handler_->CreateConfiguration(
       value,
       base::Bind(&StringResultCallback, std::string("/service/2")),
-      base::Bind(&ErrorCallback, false, std::string("")));
+      base::Bind(&ErrorCallback, false, std::string()));
   message_loop_.RunUntilIdle();
 }
 
 TEST_F(NetworkConfigurationHandlerTest, RemoveConfiguration) {
   std::string service_path = "/service/1";
 
   TestCallback test_callback;
   EXPECT_CALL(
       *mock_service_client_,
       GetLoadableProfileEntries(_, _)).WillOnce(Invoke(
@@ skipping 244 matching lines @@
       create_service_path_, shill::kGuidProperty, &guid));
   EXPECT_EQ(service_path, guid);
 
   std::string actual_profile;
   EXPECT_TRUE(GetServiceStringProperty(
       create_service_path_, shill::kProfileProperty, &actual_profile));
   EXPECT_EQ(shill_stub_helper::kSharedProfilePath, actual_profile);
 }
 
 }  // namespace chromeos