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

net/websockets/websocket_net_log_params_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 "net/websockets/websocket_net_log_params.h"
 
 #include <string>
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 TEST(NetLogWebSocketHandshakeParameterTest, ToValue) {
   ListValue* list = new ListValue();
   list->Append(new StringValue("GET /demo HTTP/1.1"));
   list->Append(new StringValue("Host: example.com"));
   list->Append(new StringValue("Connection: Upgrade"));
   list->Append(new StringValue("Sec-WebSocket-Key2: 12998 5 Y3 1  .P00"));
   list->Append(new StringValue("Sec-WebSocket-Protocol: sample"));
   list->Append(new StringValue("Upgrade: WebSocket"));
   list->Append(new StringValue("Sec-WebSocket-Key1: 4 @1  46546xW%0l 1 5"));
   list->Append(new StringValue("Origin: http://example.com"));
-  list->Append(new StringValue(""));
+  list->Append(new StringValue(std::string()));
   list->Append(new StringValue("\\x00\\x01\\x0a\\x0d\\xff\\xfe\\x0d\\x0a"));
 
   DictionaryValue expected;
   expected.Set("headers", list);
 
   const std::string key("\x00\x01\x0a\x0d\xff\xfe\x0d\x0a", 8);
   const std::string testInput =
     "GET /demo HTTP/1.1\r\n"
     "Host: example.com\r\n"
     "Connection: Upgrade\r\n"
     "Sec-WebSocket-Key2: 12998 5 Y3 1  .P00\r\n"
     "Sec-WebSocket-Protocol: sample\r\n"
     "Upgrade: WebSocket\r\n"
     "Sec-WebSocket-Key1: 4 @1  46546xW%0l 1 5\r\n"
     "Origin: http://example.com\r\n"
     "\r\n" +
     key;
 
   scoped_ptr<Value> actual(
       net::NetLogWebSocketHandshakeCallback(&testInput,
                                             net::NetLog::LOG_BASIC));
 
   EXPECT_TRUE(expected.Equals(actual.get()));
 }