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

net/base/net_util.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/base/net_util.h"
 
 #include <algorithm>
 #include <iterator>
 #include <map>
 
@@ skipping 1415 matching lines @@
   return base::StringPrintf("%s:%d", address_str.c_str(), port);
 }
 
 std::string NetAddressToString(const struct sockaddr* sa,
                                socklen_t sock_addr_len) {
   const uint8* address;
   size_t address_len;
   if (!GetIPAddressFromSockAddr(sa, sock_addr_len, &address,
                                 &address_len, NULL)) {
     NOTREACHED();
-    return "";
+    return std::string();
   }
   return IPAddressToString(address, address_len);
 }
 
 std::string NetAddressToStringWithPort(const struct sockaddr* sa,
                                        socklen_t sock_addr_len) {
   const uint8* address;
   size_t address_len;
   uint16 port;
   if (!GetIPAddressFromSockAddr(sa, sock_addr_len, &address,
                                 &address_len, &port)) {
     NOTREACHED();
-    return "";
+    return std::string();
   }
   return IPAddressToStringWithPort(address, address_len, port);
 }
 
 std::string IPAddressToString(const IPAddressNumber& addr) {
   return IPAddressToString(&addr.front(), addr.size());
 }
 
 std::string IPAddressToStringWithPort(const IPAddressNumber& addr,
                                       uint16 port) {
@@ skipping 722 matching lines @@
 
 NetworkInterface::NetworkInterface(const std::string& name,
                                    const IPAddressNumber& address)
     : name(name), address(address) {
 }
 
 NetworkInterface::~NetworkInterface() {
 }
 
 }  // namespace net