Silence a (spurious) use after free message

net/dns/async_host_resolver.cc

 // Copyright (c) 2011 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/async_host_resolver.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 379 matching lines @@
     HostCache::Key key(
         info.hostname(), info.address_family(), info.host_resolver_flags());
     cache_->Set(key, result, addr_list, base::TimeTicks::Now());
   }
 
   // Cleanup requests.
   STLDeleteElements(&requests);
   requestlist_map_.erase(rit);
 
   // Cleanup |dns_req| and start a new one if there are pending requests.
+  dns_requests_.remove(dns_req);
   delete dns_req;
-  dns_requests_.remove(dns_req);
   ProcessPending();
 }
 
 AsyncHostResolver::Request* AsyncHostResolver::CreateNewRequest(
     const RequestInfo& info,
     const CompletionCallback& callback,
     AddressList* addresses,
     const BoundNetLog& source_net_log) {
   BoundNetLog request_net_log = BoundNetLog::Make(net_log_,
       NetLog::SOURCE_ASYNC_HOST_RESOLVER_REQUEST);
@@ skipping 94 matching lines @@
         it = requests.erase(it);
       } else {
         ++it;
       }
     }
   }
   StartNewDnsRequestFor(request);
 }
 
 }  // namespace net