Avoid heap allocations in IPAddress

net/dns/mdns_client.cc

 // Copyright 2013 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/dns/mdns_client.h"
 
 #include "net/base/ip_address.h"
 #include "net/base/net_errors.h"
 #include "net/base/network_interfaces.h"
 #include "net/dns/dns_protocol.h"
@@ skipping 11 matching lines @@
   IPAddress multicast_group_number;
   bool success = multicast_group_number.AssignFromIPLiteral(address);
   DCHECK(success);
   return IPEndPoint(multicast_group_number,
                     dns_protocol::kDefaultPortMulticast);
 }
 
 int Bind(const IPEndPoint& multicast_addr,
          uint32_t interface_index,
          DatagramServerSocket* socket) {
-  IPAddress address_any(std::vector<uint8_t>(multicast_addr.address().size()));
+  IPAddress address_any(IPAddress::AllZeros(multicast_addr.address().size()));
   IPEndPoint bind_endpoint(address_any, multicast_addr.port());
 
   socket->AllowAddressReuse();
   socket->SetMulticastInterface(interface_index);
 
   int rv = socket->Listen(bind_endpoint);
   if (rv < OK)
     return rv;
 
   return socket->JoinGroup(multicast_addr.address());
@@ skipping 52 matching lines @@
   int rv = Bind(multicast_addr, interface_index, socket.get());
   if (rv != OK) {
     socket.reset();
     VLOG(1) << "Bind failed, endpoint=" << multicast_addr.ToStringWithoutPort()
             << ", error=" << rv;
   }
   return socket;
 }
 
 }  // namespace net