Added DCHECK to clarify expectations

chrome/browser/local_discovery/privet_http_asynchronous_factory_impl.cc

 // Copyright 2014 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 "chrome/browser/local_discovery/privet_http_asynchronous_factory_impl.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/local_discovery/privet_http_impl.h"
 #include "chrome/browser/local_discovery/service_discovery_shared_client.h"
 #include "chrome/common/chrome_switches.h"
+#include "net/base/net_util.h"
 
 namespace local_discovery {
 
 namespace {
 
 std::string IPAddressToHostString(const net::IPAddressNumber& address) {
   std::string address_str = net::IPAddressToString(address);
 
   // IPv6 addresses need to be surrounded by brackets.
   if (address.size() == net::kIPv6AddressSize) {
@@ skipping 32 matching lines @@
 
 const std::string&
 PrivetHTTPAsynchronousFactoryImpl::ResolutionImpl::GetName() {
   return name_;
 }
 
 void PrivetHTTPAsynchronousFactoryImpl::ResolutionImpl::Start(
     const net::HostPortPair& address,
     const ResultCallback& callback) {
 #if defined(OS_MACOSX)
+  net::IPAddressNumber ip_address;
+  DCHECK(net::ParseIPLiteralToNumber(address.host(), &ip_address));
   // MAC already has IP there.
   callback.Run(scoped_ptr<PrivetHTTPClient>(
       new PrivetHTTPClientImpl(name_, address, request_context_.get())));
 #else  // OS_MACOSX
   net::AddressFamily address_family = net::ADDRESS_FAMILY_UNSPECIFIED;
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kPrivetIPv6Only)) {
     address_family = net::ADDRESS_FAMILY_IPV6;
   }
 
@@ skipping 22 matching lines @@
 
   DCHECK(!address.empty());
 
   net::HostPortPair new_address =
       net::HostPortPair(IPAddressToHostString(address), port);
   callback.Run(scoped_ptr<PrivetHTTPClient>(
       new PrivetHTTPClientImpl(name_, new_address, request_context_.get())));
 }
 
 }  // namespace local_discovery