Remove unneeded uses of logging.h in header files.

chrome/browser/net/dns_host_info.h

 // 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.
 
 // A DnsHostInfo object is used to store status of a Dns lookup of a specific
 // hostname.
 // It includes progress, from placement in the DnsMaster's queue, to resolution
 // by the DNS service as either FOUND or NO_SUCH_NAME.
 
 #ifndef CHROME_BROWSER_NET_DNS_HOST_INFO_H_
 #define CHROME_BROWSER_NET_DNS_HOST_INFO_H_
 
 #include <string>
 #include <vector>
 
-#include "base/logging.h"
 #include "base/time.h"
 #include "googleurl/src/gurl.h"
 
 namespace chrome_browser_net {
 
 // Use command line switch to enable detailed logging.
 void EnableDnsDetailedLog(bool enable);
 
 enum DnsBenefit {
   PREFETCH_NO_BENEFIT,  // Prefetch never hit the network. Name was pre-cached.
@@ skipping 157 matching lines @@
   std::string referring_hostname_;
 
   // We put these objects into a std::map, and hence we
   // need some "evil" constructors.
   // DISALLOW_COPY_AND_ASSIGN(DnsHostInfo);
 };
 
 }  // namespace chrome_browser_net
 
 #endif  // CHROME_BROWSER_NET_DNS_HOST_INFO_H_