HostResolver supports optional CNAME lookups.

chrome/browser/intranet_redirect_detector.h

 // Copyright (c) 2010 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.
 
 #ifndef CHROME_BROWSER_INTRANET_REDIRECT_DETECTOR_H_
 #define CHROME_BROWSER_INTRANET_REDIRECT_DETECTOR_H_
 
 #include <set>
 #include <string>
 #include <vector>
@@ skipping 82 matching lines @@
 };
 
 // This is for use in testing, where we don't want our fetches to actually go
 // over the network.  It captures the requests and causes them to fail.
 class IntranetRedirectHostResolverProc : public net::HostResolverProc {
  public:
   explicit IntranetRedirectHostResolverProc(net::HostResolverProc* previous);
 
   virtual int Resolve(const std::string& host,
                       net::AddressFamily address_family,
+                      net::HostResolverFlags host_resolver_flags,
                       net::AddressList* addrlist);
 };
 
 #endif  // CHROME_BROWSER_INTRANET_REDIRECT_DETECTOR_H_