Avoid wasted work in OnProcTaskComplete().

net/dns/host_resolver_impl.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/dns/host_resolver_impl.h"
 
 #if defined(OS_WIN)
 #include <Winsock2.h>
 #elif defined(OS_POSIX)
 #include <netdb.h>
@@ skipping 1382 matching lines @@
                           const AddressList& addr_list) {
     DCHECK(is_proc_running());
 
     if (!resolver_->resolved_known_ipv6_hostname_ &&
         net_error == OK &&
         key_.address_family == ADDRESS_FAMILY_UNSPECIFIED) {
       if (key_.hostname == "www.google.com") {
         resolver_->resolved_known_ipv6_hostname_ = true;
         bool got_ipv6_address = false;
         for (size_t i = 0; i < addr_list.size(); ++i) {
-          if (addr_list[i].GetFamily() == ADDRESS_FAMILY_IPV6)
+          if (addr_list[i].GetFamily() == ADDRESS_FAMILY_IPV6) {
             got_ipv6_address = true;
+            break;
+          }
         }
         UMA_HISTOGRAM_BOOLEAN("Net.UnspecResolvedIPv6", got_ipv6_address);
       }
     }
 
     if (dns_task_error_ != OK) {
       base::TimeDelta duration = base::TimeTicks::Now() - start_time;
       if (net_error == OK) {
         DNS_HISTOGRAM("AsyncDNS.FallbackSuccess", duration);
         if ((dns_task_error_ == ERR_NAME_NOT_RESOLVED) &&
@@ skipping 780 matching lines @@
   }
   DnsConfig dns_config;
   NetworkChangeNotifier::GetDnsConfig(&dns_config);
   dns_client_->SetConfig(dns_config);
   num_dns_failures_ = 0;
   if (dns_config.IsValid())
     UMA_HISTOGRAM_BOOLEAN("AsyncDNS.DnsClientEnabled", true);
 }
 
 }  // namespace net