Remove unneeded uses of base/ref_counted.h.

chrome/browser/net/dns_master.cc

 // Copyright (c) 2006-2008 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/net/dns_master.h"
 
 #include <algorithm>
 #include <set>
 #include <sstream>
 
 #include "base/compiler_specific.h"
 #include "base/histogram.h"
 #include "base/lock.h"
-#include "base/ref_counted.h"
 #include "base/stats_counters.h"
 #include "base/string_util.h"
 #include "base/time.h"
 #include "net/base/address_list.h"
 #include "net/base/completion_callback.h"
 #include "net/base/host_resolver.h"
 #include "net/base/net_errors.h"
 
 namespace chrome_browser_net {
 
@@ skipping 467 matching lines @@
     Value* subresource_list;
     if (!motivating_host->Get(1, &subresource_list))
       continue;
     if (motivating_referrer.empty())
       continue;
     referrers_[motivating_referrer].Deserialize(*subresource_list);
   }
 }
 
 }  // namespace chrome_browser_net